How can a BPM developer implement the invocation of an Ajax service that has four parameters on a coach?

How can a BPM developer implement the invocation of an Ajax service that has four parameters on a coach?
A . Pass the parameter data as serialized XML using a JavaScript function call.
B . Provide a callback function to send parameter data using a JavaScript function call.
C . Parameter data is passed as either serialized XML or serialized JSON via REST API call.
D . Parameter data is passed as serialized JSON either using a JavaScript function call or a REST API call.

Answer: B

Explanation:

Reference: http://www.ibm.com/support/knowledgecenter/SSFPJS_8.5.0/com.ibm.wbpm.wle.editor.doc/ develop/topics/tajaxservice.html