A planar closed kinematic chain is formed with rigid links

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A planar closed kinematic chain is formed with rigid links PQ = 2.0 m, QR = 3.0 m, RS = 2.5 m and SP= 2.7 m with all revolute joints. The link to be fixed to obtain rocker (rocker-rocker) mechanism is

1. PQ
2. QR
3. RS
4. SP

Correct Option: C

The link opposite to shortest link is fixed.