Pick out the correct statement.
(A) The slope of the stripping line is always less than unity
(B) For a given separation in a binary distillation column, with increase in
reflux ratio (above the minimum reflux ratio), the fixed cost of the distillation
column first increases and then decreases
(C) In Ponchon-Savarit method of no. of theoretical plate determination, the
stripping and rectifying operating lines are vertical at total reflux
(D) Kremser-Brown-Souder's equation is used to calculate the efficiency of a
plate tower