Which of the following are considered as the 'principal standards' in the ISO series developed by the International Organization for Standardization?
A. ISO 9000
B. ISO 9001
C. ISO 9002
D. ISO 9003
E. ISO 9004
Choose the correct answer from the options given below:
1
A, B and C only
2
B, C and D only
3
C, D and E only
4
A and E only