Which Are Actions of the Extensor Digitorum

Which are actions of the extensor digitorum?

A) flexion of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints and extension of the hand at the wrist joint
B) extension of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints and radial deviation (abduction) of the hand at the wrist joint
C) flexion of the forearm at the elbow joint and flexion of the hand at the wrist joint
D) extension of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints and extension of the hand at the wrist joint