Actualization, the Highest Level of Needs on Maslow's Hierarchy of Needs

Actualization, the highest level of needs on Maslow's hierarchy of needs pyramid, is defined as primarily exhibiting what type of behavior?

A) Accepting oneself as one is at present and being content with that.
B) Accepting the constructive criticism of others in order to improve.
C) Accepting the fact that not everything one wishes for can become reality.
D) Realizing one's potential and becoming the best one can be.