Which of the following could be a reason for a failure?

 

Which of the following could be a reason for a failure?

1) Testing fault
2) Software fault
3) Design fault
4) Environment Fault
5) Documentation Fault

A. 2 is a valid reason; 1,3,4 & 5 are not
B. 1,2,3,4 are valid reasons; 5 is not
C. 1,2,3 are valid reasons; 4 & 5 are not
D. All of them are valid reasons for failure