rvec$=$Neptune, pos$-$Triton.pos

$($b$)$ Several groups have written a different lines of code to calculate the magnitude of the separation vector; some are correct and some are incorrect. From your understanding of the line$($s$)$ of code below, which of them correctly represent the magnitude of the separation vector between Neptune and Triton?

Select all that are True.

rmag$=$mag $($Neptune$.$pos$)-$mag $($Triton$.$pos$)$

rmag$-$mag $($Triton$.$ pos$)-$mag $($Neptune$.$pos$)$

rmag$=$sqrt $(($Triton$.$pos. $x-$Neptune.pos. $x$ Triton.pos. $y-$Neptune.pos. $y$ Triton.pos. $z-$ Neptune.pos. $z$

rmag$=$sqrt $($Neptune$.$pos. $x-$ Triton.pos. $x$ Neptune.pos. $y-$ Triton.pos. $y$ Neptune.pos. $z-$ Triton.pos. $z$

rmag$=$mag $($Neptune$.$ pos$-$Triton, pos$)$

rmag$-$mag $($Triton$.$ pos$-$Neptune, pos$)$

$($c$)$ Several groups have written different lines of code to calculate the unit vector that points from Neptune to Triton; some are correct and some are incorrect. From your understanding of the line$($s$)$ of code below, which of them correctly represent this unit vector?

Select all that are True.

rhat$=($Neptune$,$ pos$-$Triton.pos$)/$mag $($Neptune$.$pos$-$Triton.pos$)$

rhat$=($Triton$.$pos$-$Neptune.pos$)/$mag $($Neptune$.$pos$-$Triton.pos$)$

rhat$=($Neptune$.$pos$-$Triton.pos$)/$mag $($Triton$.$pos$-$Neptune.pos$)$

rhat Triton.pos$-$Neptune.pos$)\frac{?}{\text{m}\text{a}\text{g}}($Triton$.$pos$-$Neptune.pos$)$