Evaluate the indefinite integral $$dxx$+1$dxx$+1.$

Select one:

a$.$

$2($x$1)2+$C$2($x$1)2+$C

b$.$

$2($x$1)1/2+$C$2($x$1)1/2+$C

c$.$

$$x$+1+$Cx$+1+$C

d$.$

$2$x$+1+$C$2$x$+1+$C

Clear my choice