If $=0\mathrm{.}8$ for a block$-$spring oscillator moving along an $x$ axis, where is the block at time $t=0?$

$0$

$+x_m$

between $-x_m$ and $0,$ headed toward $-x_m$

between $0$ and $+x_m,$ headed toward $+x_m$

between $0$ and $+x_m,$ headed toward $0$

between $-x_m$ and $0,$ headed toward $0$

$-x_m$