can we work on this problem

What are the functions of a cyclin during the cell cycle ? 1. Activate a CDK 2. Direct a CDK to its targets. 3. Inhibit a CDK. 4. Control CDK activity through phosphorylation of the cyclin. 5. Control CDK activity through synthesis and destruction of the cyclin. O 1, 2, 4 and 5. O 1, 2, and 5. O 1, 4 and 5. O 2, 3, 4 and 5. O 1 and 5