I need a help!! The red color is the answer. I really need an explanation! Thank you!

Use the graph of r(x) below to answer the following parts. Assume that r(x) has a domain of all real numbers and that A, B, C, D are real numbers. A B C D X (a) Is r(x) a polynomial, rational function, or neither? Neither (b) Evaluate the following limits: i. lim r(x) 0 ii. lim r(x) 0 I-+0+ iii. lim r(x) 0 iv. lim r(A) O r-C