Assertion The unit used for measuring nuclear cross-section is ‘barn’.
Reason 1 barn `= 10^(-14) m^2`.
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.