Which Are the Attachments of the Extensor Carpi Radialis Brevis

Which are the attachments of the extensor carpi radialis brevis?

A) lateral supracondylar ridge of the humerus to the styloid process of the radius
B) medial epicondyle of the humerus (via the common flexor tendon) to the radial hand on the anterior side
C) medial epicondyle of the humerus (via the common flexor tendon) to the radial hand on the posterior side
D) lateral epicondyle of the humerus (via the common extensor tendon) to the radial hand on the posterior side