Which of These Is Correct

Multiple Choice

Which of these is correct?
Where a particular protocol applies, to be protocol-compliant you should …

A) follow, in substance, the guidelines of an approved protocol.
B) strictly follow the guidelines set down in a protocol that applies.
C) strictly follow the guidelines set down in a protocol or as it has been amended with the agreement of both parties.
D) follow the appropriate protocol only if your opponent does.