if p = (a + c) / b+d = (c+e) / d + f = (a + e) / b + f

if p = (a + c) / b+d = (c+e) / d + f = (a + e) / b + f and all variables are positive,then which is true ?

i. p= a/b
ii. p= e/f
iii. p= c/d



a. i only
b. ii only
c. i & iii
d. ii & iii
e. i,ii & iii