According to the sliding filament theory of muscle contraction, which of the following statements is true?

During muscle contraction, myosin cross-bridges bind to the thin actin filaments. These cross-bridges then ‘walk’ along the actin filaments, pulling them toward the center of the sarcomere. As the myosin cross-bridges pull the actin filaments inward toward the center of the ‘A’ band, this region shortens. As the actin filaments are pulled inward, the ‘Z’ lines to which they are attached also move closer together. This inward movement of the ‘Z’ lines is a key indicator of muscle contraction and represents the shortening of the sarcomere.