An algorithm should output "OK" if a list's numbers are all non-zero, else the output is "Not OK." Which test is a valid test of the algorithm?
1) A Input 0, 0, 0. Ensure output is "OK."
2) B Input 5, 4, 0. Ensure output is "OK."
3) C Input -3, -2, 5. Ensure output is "Not OK."
4) D Input 99, 0, 5. Ensure output is "Not OK."