What is true about Message-Driven Beans (MDBs)? 

Answer options:

A. MDBs can participate in transactions.
B. MDBs are invoked synchronously.
C. Each MDBs can process messages only from a single client.
D. MDBs retain data caches between client calls.

A

Reference: https://docs.oracle.com/javaee/7/tutorial/ejb-intro003.html