Which of the following is an example of how the Constitution sets up a balance of powers between the three branches of government?

The president is the commander-in-chief of the military, but Congress must declare war.
The president is elected for four-year terms, and senators for six-year terms.
The president and the Supreme Court justices get their jobs through different means.
The House is presided over by the Speaker of the House, and the Senate by the vice president.