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

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

A.
Dial-up, DSL. E1, T1

B.
Dial-up, ISDN, T1, E1

C.
Dial-up, ISDN, T1, DSL

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