Marbury v. Madison, an 1803 court case, affirmed which power of the Supreme Court?

This landmark decision affirmed the power of the Supreme Court to act independently of the Executive Branch--reenforcing the separation of powers that is so crucial in order for America to succeed.

I believe the answer is: power to use judicial review to determine whether a law is constitutional

In marbury v. Madison, the court established that the American courts has the power strike down laws, statutes, and executive actions that contravene the U. S. Constitution.

The 'judicial review' process is carried out to interpret the words written within the constitution, which become the basis to allow or disallow the strike down.