Find the​ vertical, horizontal, and oblique​ asymptotes, if​ any, of the given rational function.

R(x)= x^3-64÷x^2+x+20


A.
The vertical​ asymptote(s) is/are x equals=

​(Simplify your answer. Use a comma to separate answers as​ needed.)
B.
There is no vertical asymptote.
Find the horizontal​ asymptote(s), if​ any, of the function. Select the correct choice below and fill in any answer boxes within your choice.
A.
The horizontal​ asymptote(s) is/are y equals=

​(Simplify your answer. Use a comma to separate answers as​ needed.)
B.
There is no horizontal asymptote.
Find the oblique​ asymptote(s), if​ any, of the function. Select the correct choice below and fill in any answer boxes within your choice.
A.
The oblique​ asymptote(s) is/are y equals=
nothing.
​(Simplify your answer. Use a comma to separate answers as​ needed.)
B.
There is no oblique asymptote.
Click to select and enter your answer(s).