Discussion
\(I_{D}\) and \(V_{GS}\) notations in a FET denote the following parameters :
Answer: D
\(I_{D}\) and \(V_{GS}\) denote DC values.
The standard notation uses the case of the symbol and of its subscript: an upper-case symbol with an upper-case subscript (\(I_{D}\), \(V_{GS}\)) is the quiescent DC value; lower-case with upper-case subscript (\(i_{D}\), \(v_{GS}\)) is the total instantaneous value; lower-case with lower-case subscript (\(i_{d}\), \(v_{gs}\)) is the instantaneous ac component; and upper-case with lower-case subscript (\(I_{d}\), \(V_{gs}\)) is the rms or phasor value of the ac component.
So the other three options correspond to the other three combinations of letter case, not to the notation in the question.
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