Correct Answer - Option 3 : Saturday
4th day of the month is Sunday.
So,
(4 + 7) = 11th day is Sunday.
(11 + 7) = 18th day is Sunday
(18 + 7) = 25th day is Sunday.
And 30th is 5 days after 25th.
So, the day on 30th is 5 days after Sunday i.e, Friday.
6th day before the 30th day of the month i.e, 6th day before Friday is Saturday.
Hence, ‘Saturday’ is the correct answer.