It can be said that Girsanov's theorem shows the equivalence of which two items?

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Girsanov's theorem shows the equivalence between a change of measure and a change of drift. Specifically, it allows us to change a probability measure under which a given stochastic process is a Martingale to another measure under which the process has a nonzero drift. This is useful in pricing financial derivatives and managing risk, as it enables the use of risk-neutral probabilities and the replication of portfolio payoffs. The other choices do not accurately represent the relationship established by Girsanov's theorem.

It Can Be Said That Girsanov's Theorem Shows the Equivalence