Assertion: At the centre of the line joining two equal and opposite charges, `E = 0`.
Reason: At the centre of the line joining two equal and similar charge, `E != 0`.
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.