Which two analog telephony signaling methods are most vulnerable to glare conditions?

Which two analog telephony signaling methods are most vulnerable to glare conditions? (Choose
two.)

A.
FXS Loop-start

B.
FXO Ground-start

C.
E&M Wink-start

D.
E&M Delay-dial

E.
E&M Immediate-start

F.
E&M Feature Group D