What Is the Difference Between EtherChannel Auto and Desirable Modes

What is the difference between EtherChannel auto and desirable modes?

A) Auto will always initiate autonegotiation, whereas desirable will not.
B) Desirable will always initiate autonegotiation, whereas auto will not.
C) Auto will always try to negotiate to an access port first before trying other modes.
D) Desirable mode will not function and put the port into errdisable mode unless both sides of the link are in desirable.
E) Auto mode will not function and put the port into errdisable mode unless both sides of the link are in auto.