A source vs (t) =V cos 100 πt has an internal impedance

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A source v_s (t) =V cos 100 πt has an internal impedance of (4 + j3) Ω . If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in Ω should be
(a)
(b)

1. 3
2. 4
3. 5
4. 7

Correct Option: C

For max power
R_L = √R_s² + X_s² = √4² + 3² = 5