A scalable database design is one which continues to perform well as the database and its associated application grow in various ways. Which of the following are common ways in which a database must scale? $($Check all that are common dimensions of database scalability.$)$

a$.$

The transaction or request rate increases.

b$.$

The number of database administrators increases.

c$.$

The number of simultaneous users and applications that are using the database, particularly accessing the same data, increases.

d$.$

The size of the database $($the amount of data in the database$)$ increases.

e$.$

The number of hours per day or days per week that the database is in use increases.