Fluid flows through a converging duct as shown in the figure below. Cross-sectional area of the duct varies as given by the relation A = Ao(1 bx), where x is measured from the inlet, Ao is the cross-sectional area of the duct at the inlet and b is a constant. The free stream velocity is given by u = c(1+ at), where c and a are dimensional constant. The expression for acceleration assuming inviscid flow & no accumulation within the duct, is given by cb(1+at)] (1-bx)? A. a = (1+bx) cb(1-at)] a+ (1-bx)2 . (1+cx) ac(1+bt) 1 (1-bt) a C. a = (1+bx) cb(1+at) ] a+ (1-bx)? C. D. a = (1-bx)