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$4.$ The centripetal force is best explained by which of the following statements?

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a$)$ The centripetal force is the force on an object that is directed radially outward from the center of its orbit.

b$)$ The centripetal force is the force on an orbiting object that is directed along a line that is tangent to the circle.

c$)$ The centripetal force is a new type of force acting on an orbiting object that maintains it in uniform circular motion, other than weight, tension, friction, normal force, air resistant force, thrust force.

d$)$ The centripetal force is a fundamental force of nature.

e$)$ The centripetal force is the net force acting on an orbiting object that maintains it in uniform circular motion.