The coefficients of discharge ,velocity, contraction C_{d},C_{v},C_{c},are related as

A

$$C_{d}=C_{v}+C_{c}$$

B

$$C_{d}=C_{v}-C_{c}$$

C

$$C_{d}=C_{c}+C_{v}$$

D

$$C_{d}=C_{c} \times C_{v}$$