In a series RLC circuit, the locus of the tip of the admittance

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In a series RLC circuit, the locus of the tip of the admittance phasor in the complex plane as the frequency is varied, is—

1. A semicircle in the upper half of the G-B plane having the centre at
  1 ‚ 0 and radius 1
  R R
2. A circle in the upper half of the G-B plane having the centre at
  1 ‚ 0 and radius 1
  (2R) (2R)
3. A semicircle in the bottom half of the G-B plane having the centre at
  –1 ‚ 0 and radius 1
  (2R) (2R)
4. A semicircle in the upper half of the G-B plane having the centre at
  – 1 ‚ 0 and radius 1
  R R

Correct Option: C

NA