Triangle ABC with segment BD where point D is between points C and A, BC equals x, BD equals y, CD equals w, DA equals z, and BA equals v What expression represents the value of v?

v equals the square root of quantity z times y end quantity
v equals the square root of quantity w times z end quantity
v equals the square root of quantity w times the sum of w plus z end quantity
v equals the square root of quantity z times the sum of w plus z end quantity