In oder to erect a perpendicular to a line bythe method inducate in figure the distance bc is equal to 40 ft. when the zero mark of a 100-ft tape is held a point B and a man point D hold the 30-mark and the 34-ft mark toguether at the point , the line BD will be perpendicular to the lineBC if the reading of the tape at point C is how many feet is it A96ft or B 94ft or C 86ft or D84ft wich one is correct?