When did Swat Valley Become Part of Pakistan?

Q: When did Swat Valley Become Part of Pakistan?

1. 1947
2. 1965
3. 1969
4. 1972

From 1926 to 1947, this area was a princely state that was in alliance with the British Indian Empire. After the Independence of Pakistan, it continued to be an autonomous region until 1969. It was dissolved in Pakistan in 1969 and was included in the jurisdictions of the province of Khyber Pakhtunkhwa. This area was under Taliban seizure in 2007. However, after a long campaign, military forces were able to take back control in this area. This area is enriched with natural beauty and is famous for tourism. So, these are the details regarding When did Swat Valley Become Part of Pakistan?