Which of the following code blocks correctly splits the storeCategory column from DataFrame storesDF at the underscore character, creating two new columns named storeValueCategory and storeSizeCategory?

A sample of DataFrame storesDF is shown below:

storeId  open    openDate    storeCategory
0        true    1100746394  VALUE_MEDIUM
1        true    944572255   MAINSTREAM_SMALL
2        false   925495628   PREMIUM_LARGE
3        true    1397353092  VALUE_MEDIUM
4        true    986505057   VALUE_LARGE
5        true    955988614   PREMIUM_LARGE