Following questions are based on the given information for the following functions f (x)
`f(x) =2bx +f(-x)," if " x lt 0`
`f(x)=a, " if "x =0`
`f(x)=b+c-2cx +f(x-1)," if "x gt 0`
f(-19) equals:

Options

A. a - 19b + 361c
B. a + 19(b - 19c)
C. a - 19(b + 19c)
D. none of these

Answer

C