Identify the correct statement(s) among the following 

(A)  $s{p}^2$  hybrid orbital is longer than sp-hybrid orbital due to higher p-character
(B) In $N{H}_3$ , N undergoes $s{p}^3$ hybridization where as in $P{H}_3,P$   uses pure p-orbitlas 
(C) $C-Cl$ bond is longer than $C-F$   bond
(D) Bond strength $\propto$  bond multiplicity