Question: In the C - Style input function scanf ( % d , &i ) , what does the character & mean?

In the C-Style input function scanf("%d", &i), what does the character "&" mean?
that the parameter is an integer.
that the parameter is the address of the variable where the value should be stored.
the the parameter is the value that should be stored in the variable.
the & indicates the type of the variable.
In the C-Style input function scanf("%d", &i), what does the character

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