To Say That an Action of Yours Was Supererogatory Is

To say that an action of yours was supererogatory is to say:

A) That you ought not to have done it, but it wasn't strictly forbidden.
B) That it was good that you did it, but it wouldn't have been wrong for you not to do it.
C) That it doesn't matter, morally speaking, that you did it.
D) That it would be seriously morally wrong for you not to have done it.