A single microfilament is composed of both actin and myosin. Or Actin and myosin are separate microfilaments?

A single microfilament is composed of both actin and myosin. Or Actin and myosin are separate microfilaments?

Separate

Microfilaments refer to the actin polymers. They may be associated with motor proteins to form the cross-bridge for movement and the most predominant of the motor proteins is myosin.

Myofibrils are the elements that form muscle fibres and are comprised of actin and myosin. Thank you.