“[The services a monarch must provide for his people] consisted in the maintenance of the laws; a strict execution of justice; . . . and defending the state against its enemies. It is the duty of this magistrate to pay attention to agriculture; it should be his care that provisions for the nation should be in abundance, and that commerce and industry should be encouraged. He is a perpetual sentinel, who must watch the acts and the conduct of the enemies of the state . . . . If he be the first general, the first minister of the realm, it is not that he should remain the shadow of authority, but that he should fulfill the duties of such titles. He is only the first servant of the state.”

The Western Tradition, Eugene Weber, 1972

What is the best definition of the word sentinel from this passage?
a.
Guard
c.
King
b.
Judge
d.
Soldier