Question: An array of 1 0 , 0 0 0 Student objects, arr [ 0 ] , arr [ 1 ] , . . . ,

An array of 10,000 Student objects, arr[0], arr[1],..., arr[9999] is to be searched for a particular Student whose ID number
only is known. In order to do a binary search, which of the following is a necessary precondition?
The array is sorted by ID number.
The array is in alphabetical order by name.
The array is sorted by ID number and alphabetically by name.
The ID number key is in the array.
No two students in the array have the same name.
An array of 1 0 , 0 0 0 Student objects, arr [ 0

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