Threshold voltage of MOSFET can be lowered by: (i) Reducing

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Threshold voltage of MOSFET can be lowered by:
(i) Reducing doping in substrate
(ii) Increasing doping in substrate
(iii) Decreasing gate oxide thickness
The correct statement are—

1. (iii) only
2. (i) and (iii) only
3. (i) and (ii) only
4. (ii) only

Correct Option: A

NA