In the following question, a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggested, select the one which best express the same sentence in Indirect/Direct speech. The doctor advised the patients to give up smoking.

• The doctor said to the patients, "Why don't you give up smoking?"
• The doctor said to the patients, "You should give up smoking."
• The doctor said to the patients, "Give up smoking."
• The doctor said to the patient, "I am advising you to give up smoking."