What is the heuristic that is explained below?

Sort skus and create a list

Removes sku from the list and try to fit onto current shelf

If sku fits, add it to the shelf and continue

If sku does not fit, move down the list and select next sku

If the shelf is full, terminate $($and select an empty shelf$)$

Question $7$ options:

Worst fit

Best fit

Next fit

First fit