What Indicators BEST Describe Scapulohumeral Rhythm

What indicators BEST describe scapulohumeral rhythm?

A) Beyond 10° of glenohumeral abduction and 30° of flexion, for every 3° of movement, 1° of movement occurs at the glenohumeral joint and 2° at the scapulothoracic joint.
B) As movement begins at the glenohumeral joint, for every 3° of movement, 2° of movement occurs at the glenohumeral joint and 1° at the scapulothoracic joint.
C) As movement begins at the glenohumeral joint, for every 3° of movement, 1° of movement occurs at the glenohumeral joint and 2° at the scapulothoracic joint.
D) Beyond 30° of glenohumeral abduction and 60° of flexion, for every 3° of movement, 2° of movement occurs at the glenohumeral joint and 1° at the scapulothoracic joint.