Given arrangement is in equilibrium and elongation in spring is 1cm. Tension in string AD is `T_1`, in string BD is `T_2` and is string CD is `T_3`.Choose correct values of `T_1,T_2 and T_3`:
A. `T_1=80 N, T_2=50 N`
B. `T_1=80 N, T_2=30 N`
C. `T_1=80 N, T_3=70 N`
D. `T_1=80 N, T_3=100 N`