What is the effect of PortFast on the MAC aging process?

What is the effect of PortFast on the MAC aging process?
A . It ignores the MAC aging timer when RSTP is in use
B . It prevents fast aging of MAC addresses when RSTP is in use
C . It ignores the MAC aging timer when IEEE 802. 1D is in use
D . It prevents fast aging of MAC addresses when IEEE 802.1D is in use

Answer: D