A plate is held by a chain AB through hinge joints. The plate is pulled with a force T as shown in figure. The tension in the chain is given by

A

$$ \left(\frac {\sqrt{3}} {2}\right) T $$

B

$$ \left(\frac {\sqrt 2} {3}\right) T $$

C

$$ \frac {T} {2} $$

D

$$ 3 \sqrt 2 T $$