When did the State of Punjab carved out by the Punjab Reorganization Act?

Consider the following statements:

I. In $1950$, two separate states were created; Punjab included the former Raj province of Punjab, while the 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. Ludhiana was named the temporary capital of Punjab from $1947-52$.

IV. Himachal Pradesh was created as a Union Territory from several princely states and Kangra districts.

Which of the statements given above/is correct?