Option (b) is correct.

Statements A and B are logically equivalent.

Statement A, "Some physicists are outstanding professors," means that there is at least one physicist who is also an outstanding professor.

Statement B, "Some physicists are not non-outstanding professors," means that there is at least one physicist who is not a non-outstanding professor. This is equivalent to saying that there is at least one physicist who is an outstanding professor, which is the same as Statement A.

Therefore, the correct answer is (b) A and B only, as statements A and B are logically equivalent.

विकल्प (b) सही है।

"कुछ भौतिकशास्त्री उत्कृष्ट प्रोफेसर होते हैं" तथा "कुछ भौतिकशास्त्री गैर-उत्कृष्ट प्रोफेसर नहीं होते हैं" दोनों कथन तार्किक रूप से समतुल्य हैं क्यूँकि दोनों ही कथनों का अर्थ समान है केवल दो ऋणात्मक पदों को जोड़कर कथन की प्रस्तुति बदली गई है।