Consider the grammar given below.

$Sas|Dx|Y$

$YY|Y|d||$

$DYgx$

$xh|hx|$

Which terminal$($s$)$ is$/$are in FIRST$($D$)?$ List it$/$them$,$ separated by $-$ if more than one $($e$.$g$.$ if the answer is $\{a,b,c\},$ you should write $a-b-c.$ Do not include any spaces in your answer.

The correct answer is: $d-g$