The effect of a ventral fin on the static stability of an aeroplane is as follows: (1=longitudinal,2=lateral, 3=directional)A) 1: positive, 2: negative, 3: negativeB) 1: negative, 2: positive, 3: positiveC) 1: no effect, 2: positive, 3: negativeD) 1: no effect, 2: negative, 3: positive