Which choice lists connection types in the correct sequence by speed of transmission, from the slowe

Which choice lists connection types in the correct sequence by speed of transmission, from the
slowest connection type to the fastest?

A.
Dial-up, ISDN, T1, DSL

B.
Dial-up, ISDN, T1, E1

C.
ISDN, dial-up, T1, fiber-optic

D.
Dial-up, DSL, E1, T1