64. Hash table is a useful data structure for accessing the target data rapidly. Which one of
the following is NOT a good hash key choice？
(A)Use the first number digit of Taiwan identity number as the hash key for the member
data of a company
(B)Use birthday as the hash key for the student data of a class
(C)Use email as the hash key for the employee data of a company
(D)Use squad number as the hash key for the player data of a football team
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