Database Design Multiple Choice

According to class material, when we need to choose one primary key out of all the candidate keys in an entity, we should choose the one that ____ to be the primary key. (a) is complex, with more than one key attribute combined, over one is composed of just one key attribute (b) is with values that can change over time (c) has embedded meaning over those that do not have embedded meanings (d) should not pose a security risk or violation (e) None of (a) through (d) is the correct