To identify the correct number of electors and seconders required for proposing a candidate for the President of India:
1. According to the Indian Constitution, a candidate for the office of the President must be proposed by at least 50 electors and seconded by at least 50 other electors.
2. This ensures a broad base of support for the candidacy.
3. The other options do not meet the constitutional requirement.
Therefore, the correct answer is (1) At least 50 electors and 50 seconders.