In the mechanism shown, the fixed link denoted as 1, crank AB as 2, rocker BD as 3, swivel trunion at C as 4. The instantaneous centre I41 is at

(a) the centre of the swivel trunion

(b) the intersection of line AB and a perpendicular to BD at C

(c) infinity along AC

(d) infinity perpendicular to BD

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infinity perpendicular to BD

option d

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