Which two statements accurately describe the invoking of a human task?

Which two statements accurately describe the invoking of a human task?

A.
A web service client in a different composite can invoke a human task.

B.
A human task can invoke another human task in the same composite.

C.
A BPEL process can invoke a human task in a different composite.

D.
A human task can invoke another human task in a different composite.

Explanation:

http://docs.oracle.com/cd/E23943_01/dev.1111/e10224/bp_hwfmodel.htm