The soluton for the indifinite integral

$($cos x$)4$ dx is:

Question $5$ options:

I$=0\mathrm{.}25[1\mathrm{.}5$x$+$sin $2$x$+($sin $4$x$)/8]+$C

I$=0\mathrm{.}25[1\mathrm{.}5$x$+$cos $2$x$+($cos $4$x$)/8]+$C

I$=0\mathrm{.}25[0\mathrm{.}5$x$+$sin $2$x$+($sin $4$x$)]+$C

I$=[1\mathrm{.}5$x$+$sin $2$x$+($sin $4$x$)/4]+$C