What Was Significant About the Case of R

What was significant about the case of R. v. Commercial Credit Corp.?

A) It is one of the few cases where the postbox rule has been extended beyond communication by mail or telegram.
B) It confirmed that acceptance by post is always appropriate.
C) It abolished the postbox rule in Canada.
D) It determined that consideration is unnecessary in cases where consensus has been achieved in writing.
E) It determined that the postbox rule should be extended letters of revocation as well as letters of acceptance.