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The type of memory that can retain its content after a system reboot is ROM. ROM stands for Read-Only Memory, which is a type of non-volatile memory that stores data permanently even when the power is turned off. ROM can only be read by the CPU, but not written or modified. ROM contains essential data and instructions that are needed for the system to boot up and operate, such as the BIOS (Basic Input/Output System) or the firmware. DDR is not the type of memory that can retain its content after a system reboot, but rather a type of RAM. RAM stands for Random Access Memory, which is a type of volatile memory that stores data temporarily while the computer is running. RAM allows fast access and modification of data by the CPU, but it loses its contents when the power is turned off. DDR stands for Double Data Rate, which is a technology that allows RAM to transfer data twice as fast as normal RAM. DDR has different generations, such as DDR2, DDR3, or DDR4, which have different speeds and capacities. DIMM is not the type of memory that can retain its content after a system reboot, but rather a type of module or package that contains RAM chips. DIMM stands for Dual In-line Memory Module, which is a circuit board that has RAM chips on both sides and pins on both edges. DIMM can be inserted into slots on the motherboard to increase the amount of RAM available for the system. DIMM has different types and sizes, such as SDRAM, DDR, DDR2, DDR3, or DDR4 DIMMs. RAM is not the type of memory that can retain its content after a system reboot, but rather the type of memory that loses its content when the power is turned off. RAM stands for Random Access Memory, which is a type of volatile memory that stores data temporarily while the computer is running. RAM allows fast access and modification of data by the CPU, but it loses its contents when the power is turned off. RAM can be packaged into modules or packages, such as DIMMs or SO-DIMMs. References: The Official CompTIA IT Fundamentals (ITF+) Student Guide (Exam FC0-U61), Chapter 1: IT Fundamentals1

 The code uses a for loop to iterate from 1 to 3, and assigns the value of i to the variable x. Then, it adds 3 to x and prints the result. The output of the code is:

3 (when i = 1, x = 1, x + 3 = 4) 6 (when i = 2, x = 2, x + 3 = 5) 9 (when i = 3, x = 3, x + 3 = 6)

References: CompTIA IT Fundamentals+ Study Guide: Exam FC0-U61, Second Edition, Chapter 4: Programming Concepts and Data Structures, page 153.

 A WLAN card would be the best choice for a user who wants to use a laptop outside the house and still remain connected to the Internet. A WLAN card stands for wireless local area network card, which is a device that allows a laptop to connect to a wireless network using radio waves. A WLAN card can enable a laptop to access the Internet through public or private wireless hotspots, such as cafes, libraries, airports, or homes. References : The Official CompTIA IT Fundamentals (ITF+) Study Guide (FC0-U61), page 170.