What is the definition of electric field?

I- It is the region of space that surrounds a charge in which it exerts its presence on any other.
II- It is a scalar quantity that indicates the electric force acting on each unit of charge placed at a particular point in the field.
III- It is a vector quantity that indicates the electric force acting on each unit of charge placed at a particular point in the field.
IV- It is a vector quantity that applies an electric force to any charge placed inside it.
a) I and II are correct.
b) II and IV are correct.
c) III and IV are correct.
d) I and III are correct.