The passage below is from the Florida Constitution:

"The supreme executive power shall be vested in a governor, who shall be commander-in-chief of all military forces of the state not in active service of the United States. The governor shall take care that the laws be faithfully executed."

Which official in the U.S. Constitution is most similar to the state official described above?
Speaker of the House
President pro tempore of the U.S. Senate
Chief Justice of the Supreme Court
President of the United States