Evaluate the impact of PI3K activity on the insulin signaling pathway.

PI3K activity inhibits the conversion of PIP2 to PIP3, blocking the signaling pathway.

PI3K activity is crucial for converting PIP2 to PIP3, which is essential for downstream activation of PKB.

PI3K activity has no effect on the insulin signaling pathway.

PI3K activity degrades PIP2, preventing the formation of PIP3.