Which of the Following Describes Two Desirable Characteristics of a Primary

Multiple Choice

Which of the following describes two desirable characteristics of a primary key?

A) A primary key should be a value that may be null and may change over time.
B) A primary key should be a value that is not null and will never change.
C) A primary key should consist of meaningful data and a value that can be changed if needed.
D) A primary key should not consist of meaningful data and a value that can be changed if needed.