Are both striated and electrically coupled to neighboring fibers. are both smooth and under involuntary control. are both smooth and operate independently of other skeletal muscle fibers. are both smooth and under voluntary control. are both striated and under voluntary control.

All skeletal muscle fibers are both striated and under voluntary control. 
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. A skeletal muscle fibers consists of multiple bundles of cells called fibers.