A particular cyclin called cyclin E forms a complex with Cdk 2 (cyclin-dependent kinase 2). This complex is important for the progression of the cell from G₁ into the S phase of the cell cycle. Which of the following statements is correct?

A) The amount of free cyclin E is greatest during the S phase.
B) The amount of free Cdk 2 is greater during G₁ compared to the S phase.
C) The amount of free cyclin E is highest during G₁.
D) The amount of free Cdk 2 is greatest during G₁.
E) The activity of the cyclin E/Cdk 2 complex is highest during G₂.