QUESTION $2$

A point charge $Q_1=1nC$ is located at the origin of a Cartesian coordinate system. The charge is enclosed by a surface $S$ with its center at the origin of the same system. The total electric flux leaving the surface $S$ is given by:

$-o{\displaystyle \underset{D}{\overset{\phantom{}}{}}}$vec$(D)*vec(ds)$

$-{}_D*vec(ds)$

${}_D$vec$(D)*vec(ds)$

$o{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}$vec$(D)*vec(ds)$