Final answer:
The correct order to fill a 2 row x 4 column K-map is 1) 1, 2, 3, 4.
Step-by-step explanation:
The correct order to fill a 2 row x 4 column K-map is 1) 1, 2, 3, 4. The K-map is used in digital logic design to simplify Boolean expressions. It is divided into cells, where each cell represents a combination of inputs. The numbers 1, 2, 3, and 4 represent the entries in the K-map cells, starting from the top left and going row by row.