Find each indicated quantity if it exists. Let f(x) = 20 + x, for x50 Complete parts (A) through (D). 20 -x, for x > 0 . . . (A) Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. lim f(x) = (Type an integer.) x-+0+ O B. The limit does not exist. (B) Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. lim f(x) = (Type an integer.) X-0 O B. The limit does not exist. (C) Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. lim f(x) = (Type an integer.) X-0 O B. The limit does not exist