Consider the following statements:

I. In $1950$, two separate states were created, Punjab included the former Raj province of Punjab, while Princely states were combined into a new state, the Patiala and East Punjab States Union (PEPSU).

II. In $1956$, PEPSU was merged into the Punjab state.

III. Shimla was named the temporary capital of Punjab.

IV. Himachal Pradesh was created as a Union Territory from several Princely states and Kangra district.

Which of the statement(s) is/are correct?