Select all that are true of operational database design. $($Check all that are true.$)$

a$.$

The implementation phase of operational database design includes creating the database storage structure and loading the database.

b$.$

The performance of an information system depends heavily on operational database design.

c$.$

Operational database designs that fail to recognize that the database is part of a larger information system are not likely to be successful.

d$.$

The primary objective of operational database design is to create complete, denormalized, redundant and fully integrated conceptual, logical$,$ and physical database models.