$1.$ Given string str$1$ and string str$2,$ which expression is true?

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char str$1[10]="$Hi$"$; char str$2[10]=$ "Hello";

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$($a$)$ strcmp$($str$1,$ str$2)==0$

$($b$)$ strcmp$($str$1,$ str$2)<0$

$($c$)$ strcmp$($str$1,$ str$2)>0$

$($d$)$ The comparison is not possible.