Answer:
The Senate can invoke cloture to limit debate and proceed to a floor vote.
Step-by-step explanation:
1st option: Proceeding to a vote would definitely end any sort of tactic to stall the approval of the candidate.
2nd option: The candidate can't be approved without votes, otherwise it would be an unfair election.
3rd option: Blocking all candidates from being recommended is against the policy for a fair election.
4th option: This would make the filibuster more effective and let the senators waste more time.
Hence, option 1 is the right answer.