Which of the following code blocks correctly returns a DataFrame with a month column containing the integer month value extracted from the openDate column in storesDF?

Note: The openDate column is of integer type and stores UNIX epoch timestamps (seconds since midnight January 1, 1970).

A sample of storesDF is shown below:

storeId  openDate
0        1100746394
1        1474410343
2        1116610009
3        1180035265
4        1408024997