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 G₂transition, what can be inferred about its possible role in regulating the cell cycle?

A) This protein inhibits S-phase Cdks.
B) This protein activates S-phase Cdks.
C) This protein inhibits G1/S Cdks.
D) This protein activates G1/S Cdks.
E) This protein is involved in DNA synthesis.