Determine the correctness or otherwise of the following Assertion (a) and Reason (r):Assertion (a): IPTG (Isopropylthiogalactoside) is a gratuitous inducer of lac operon. Reason (r) : IPTG is an efficient inducer, but not a substrate of lac operon

• A. Both (a) and (r) are true and (r) is the correct reason for (a)
• B. Both (a) and (r) are true but (r) is not the correct reason for (a)
• C. (a) is true but (r) is false
• D. (a) is false but (r) is true