Which of the Following Best Describes the Insertion of the Extensor

Multiple Choice

Which of the following best describes the insertion of the extensor digitorum?

A) It indirectly inserts on all digits of the hand.
B) It indirectly inserts on all digits of the hand except the thumb.
C) It directly inserts on all digits of the hand.
D) It directly inserts on all digits of the hand except the thumb.
E) It directly inserts on the index finger only.