Which one of the following is FALSE about the primary key?

Two rows in a table cannot have the same value in the primary key column.

The primary key is often a column whose values are assigned by a system or a program $($e$.$g$.$ sequential numbers or random assigned by a system or a program$).$

Last name of customers should be used as the primary key in the customer table.

Some candidate keys are NOT suitable to be the primary key.

None of the others is FALSE $($all of the others are TRUE about the primary key$).$