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X Your answer is incorrect.

Which of the following are improper integrals? Explain why.

$($a$){\displaystyle \underset{1}{\overset{}{}}}\frac{sinx}{x}dx$

$($b$){\displaystyle \underset{4}{\overset{5}{}}}\frac{1}{x}dx$

$($c$){\displaystyle \underset{3}{\overset{4}{}}}\frac{1}{sinx}dx$

$($d$){\displaystyle \underset{-5}{\overset{3}{}}}{x}^{-\frac{1}{3}}dx$

$($e$){\displaystyle \underset{-10}{\overset{10}{}}}f(x)dx$ where