Problem $2$ Consider the code below. Answer the questions with one sentence each.

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$1$ boolean digitalRead$\_$debounced$($int button$\_$id$)\{$

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$2$ boolean state$[3]$; $//$ to hold three consecutive readings of input

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$3$ do $\{$

$4$ state$[0]=$ digitalRead$($button$\_$id$)$;$$

$5$ delay$(5)$;

$6$ state$[1]=$ digitalRead$($button$\_$id$)$;$$

$7$ delay$(5)$;$$

$8$ state$[2]=$ digitalRead$($button$\_$id$)$;$$

$9\}$ while $($state$[0]!=$ state$[1]||$ state$[1]!=$ state$[2])$;$$

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$10$ return state$[0]$;$$

$11\}$

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a$)$ What does $$boolean$$ in Line $1$ indicate?