Which of the Following Is an Acceptable Technique for Implementing

Multiple Choice

Which of the following is an acceptable technique for implementing supertype/subtype entities?

A) Each supertype and subtype can be implemented with a separate table.
B) The subtypes may be collapsed into the supertype to create a single table.
C) The supertype's attributes could be duplicated in a table for each subtype.
D) A and C
E) all of these