Assertion: If `veca and vecb` re reciprocal vectors, then `veca.vecb=1`, Reason: If `veca=lamda vecb,` `lamda epsilon R^+ and |veca||vecb|=1`, then `veca and vecb` are reciprocal. (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.