In ATM, the physical layer:

A.
Is responsible for HEC Generation and Verification.

B.
Has twp sublayers: Segmentation and Reasembly, and Line Coding.

C.
Has two sublayers: Transmission Convergence, and Physical Media Dependent.

D.
Does not have sublayers.

E.
Is responsible for Time Recovery.

Explanation:
The physical layer is divided into two parts: The Physical Medium sub-layer (PMD) and The Transmission Convergence sub-layer (TC)