According to montesquieu, who should exercise executive power? who should exercise legislative power? why?

As indicated by Montesquieu, the official power ought to be in the hands of a ruler, or a solitary individual, though the authoritative power ought to be held by many individuals. This is on account of the official branch of government, "which has dependably need of endeavor," is all the more effectively keep running by one individual. The authoritative branch, as indicated by Montesquieu, is better directed when it is controlled by many individuals.