${\displaystyle \underset{0}{\overset{\sqrt[\phantom{2}]{5}}{}}}[x]dx$ is

$($a$)2\sqrt[\phantom{2}]{5}$

$($b$)2\sqrt[\phantom{2}]{5}-1$

$($c$)2\sqrt[\phantom{2}]{5}-2$

$($d$)2\sqrt[\phantom{2}]{5}-3$