39, which of the following are complete integrals of the partial differential equation pgx + yg =1? (b) z-%++b (d) (z - b)} =4 (ax + y) (a) z- b (c) z= 4 (ax +

39, Which of the following are complete integrals of the partial differential equation pgx + yg =1? (B) z-%++b (D) (z - b)} =4 (ax + y) (A) z- b (C) z= 4 (ax + y) +b