Assertion: The expression of potential energy `U=1/(4piepsilon_0)(q_1q_2)/(r_(12))` is unaltered whatever way the charges are brought to the specified locations.
Reason: Path-independence of work for electrostatic force.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.