To answer this question, we need to understand what exhaustive testing means.
Exhaustive testing is a testing technique where every possible input combination is tested. It aims to cover all possible scenarios and combinations to ensure that the system behaves correctly under all conditions.
Now let's go through each option and analyze them:
Option A) Is impractical but possible - This option is correct. Exhaustive testing is considered impractical because it would require testing every possible input combination, which can be time-consuming and resource-intensive. However, in theory, it is possible to perform exhaustive testing.
Option B) Is practically possible - This option is incorrect. Exhaustive testing is not considered practically possible due to the large number of possible input combinations.
Option C) Is impractical and impossible - This option is incorrect. While exhaustive testing is impractical, it is not impossible.
Option D) Is always possible - This option is incorrect. Exhaustive testing is not always possible due to the large number of possible input combinations.
Therefore, the correct answer is option A) Is impractical but possible.