$($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 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$-$Triton.pos$)$

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

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

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