If a Given Protein's Level Peaks Early in G₁, but Is

Multiple Choice

If a given protein's level peaks early in G₁, but is absent before the G₂ transition, what can be inferred about its possible role in regulating the cell cycle? ​

A) This protein inhibits Cdk1. ​
B) This protein activates Cdk1.
C) This protein inhibits Cdk2.
D) This protein activates Cdk2.
E) This proteins is involved in DNA synthesis.