Final answer:
The lowest value of rand_max depends on the programming language used.
Step-by-step explanation:
The lowest value that rand_max can be depends on the programming language used. In most programming languages, including C and C++, rand_max is defined as the maximum value that can be generated by the rand function. This value is usually a large positive integer, such as 2^31 - 1. So, the answer to your question is d) It depends on the programming language used.