Which notarial act is described in the language below?
"Before me, Nancy Notary, on this day personally appeared Sally Smith known to me (or proved to me on the basis of satisfactory evidence) to be the person whose name is subscribed to the foregoing instrument and acknowledged to me that she executed the same for the purposes and consideration therein expressed."

A. Oath/Affirmation
B. Acknowledgment
C. Verification of Fact
D. Jurat