The Senate features a formal leadership structure in which the two top positions $($the President of the Senate and the President Pro Tempore of the Senate$)$ have historically been largely symbolic and ceremonial, with little substantive political power $($although the President of the Senate can cast a tie$-$breaking vote in the Senate$).$ The individuals who currently hold these two positions are:

A$)$ Mike Pence and Chuck Grassley.

B$)$ Mitch McConnell and Chuck Schumer.

C$)$ Kamala Harris and Patty Murray.Leahy.

D$)$ Nancy Pelosi and Steny Hoyer.