Question: Which JavaScript expression returns the substring rock? Question 7 8 options: We will rock you!.substr ( 8 , 1 2 ) We will

Which JavaScript expression returns the substring "rock"?
Question 78 options:
"We will rock you!".substr(8,12)
"We will rock you!".slice(8,10)
"We will rock you!".substring(-9,4)
"We will rock you!".substr(-9,4)

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