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Both statement b and c are correct.

It is not possible to set parameters for custom mediators.

Custom mediator's parameters should be declared as public fields in mediator code. For instance: public String foo, bar;

Synapse properties can be used to pass values to mediator arguments. For instance:

Mutual SSL provides message level security.

Mutual SSL provides higher performance.

All of the above are correct.

Both client and server have to authenticate each other and require certificates to be configured at both server and client ends.

Data Mapper mediator can perform JSON-to-JSON transformation without converting the message to a canonical form.

All the transformation mediators require SOAP as the canonical message format.

Enrich mediator cannot be used for message transformation.

Header mediator can only work with SOAP headers.

Use of class variables is not recommended.

You can define and use a global variable in the mediator class if and only if those variables are shared with all the messages in that particular message flow.

When we use the mediatorin different artifacts, an instance of the mediator gets created for each occurrence in the configuration.

A mediator instance gets created for each occurrence in the configuration and for each message.