Of the four options given, choose the most appropriate one.

Option (1) correctly uses the past tense verb "advised" and follows the structure for reported speech.
Option (2) is incorrect because "advises" is present tense and "for focusing" is not the correct form. It should be "to focus."
Option (3) is incorrect as "advise" is used without the necessary tense modification. It should be "advised" to match the subject.
Option (4) is incorrect because "advising" is a present participle and requires a helping verb (e.g., "is advising").
Therefore, Option (1) is the most appropriate and grammatically correct option.