To answer this question, we need to understand the purpose and functionality of the ARITH(COMPAT) compiler option.
The ARITH(COMPAT) compiler option is used to control the maximum number of digits allowed in arithmetic calculations in a program. It ensures compatibility with older versions of the programming language.
Now let's go through each option to determine the correct answer:
Option A) (1) 40 - This option is incorrect because it does not match the correct answer given.
Option B) (2) 45 - This option is incorrect because it does not match the correct answer given.
Option C) (3) 31 - This option is incorrect because it does not match the correct answer given.
Option D) (4) 18 - This option is correct because it matches the correct answer given. The ARITH(COMPAT) compiler option allows you to control the maximum number of digits to 18.
Therefore, the correct answer is D) (4) 18.