21. if x are four vector co-ordinates then match the correct options from columns i and il. column column ll (a,) x (b,) x +xu (a) square of length of four vect

21. If X are four vector co-ordinates then match the correct options from Columns I and Il. Column Column ll (a,) X (b,) X +Xu (a) Square of length of four vector s (b)x, X, X, X (b)XX (A) a, b,: a,> b, (B) a,b a, b (C) a,b a, b, (D) a,ba,b