IBM interview -- Client asked you to complete the testing with in a week

Hi Friends,

This is the question asked by IBM interviewers to one of the candidate.

"Client asked you to complete the testing with in a week, what you do ? how will you approach?"

Let's make a clear discussion on it.

Tell me what you think is the best answer for this question?

1) I will do Adhoc Testing
2) It Can't be tested
3) Depending on project, I will test functionality first. 4) Depends on client requirements
5) Ask for more time to the client

Please comment with your answer.