Given the following two code snippets, which statement correctly describes the difference in output?

Snippet $1$:

sum $=0$;

let nums $=[10,20,30]$;

for $($num of nums$)\{$

$$ sum $+=$ num;

$\}$

console.log$($sum$)$;

$$

Snippet $2$:

sum $=0$;

let nums $=[10,20,30]$;

for $($num in nums$)\{$

$$ sum $+=$ num;

$\}$

console.log$($sum$)$;

Snippet $1$ outputs $30,$ and Snippet $2$ outputs $6.$

Snippet $1$ outputs $60,$ and Snippet $2$ outputs $3.$

Snippet $1$ outputs $60,$ and Snippet $2$ outputs $60.$

Snippet $1$ outputs $60,$ and Snippet $2$ outputs $"012".$