You have an issue where all threads are waiting for a specific transaction to be executed first. What is this issue related to? 

Answer options:

A. It is caused by THREAD and THREADRANGE being used with wildcard MAP statements.
B. It is caused by the thread with the highest thread ID applying barrier transactions.
C. It is caused by the use of the MAXTRANSOPS parameter.
D. It is caused by barrier transactions in a Coordinated Replicat.

D

Reference: https://docs.oracle.com/goldengate/1212/gg-winux/GWUAD/wu_changesync.htm#GWUAD953