Which of the following points represent the essential features of switchgear?
i) Complete reliability
ii) Absolutely certain discrimination
iii) Quick operation
iv) Provision for manual control
1
(ii), (iii) and (iv) only
2
(i), (iii) and (iv) only
3
(i), (ii), (iii) and (iv)
4
(i), (ii) and (iii) only
5
(i), (ii) and (iv) only