A data cube refers to a:

Select one:

a$.$ heads$-$up display of critical indicators that allow managers to get a graphical glance at key performance metrics.

b$.$ combination of fields used to uniquely identify a record, and to relate separate tables in a database.

c$.$ firm that collects data with the intention of reselling it to others.

d$.$ secure$,$ cloud$-$based off$-$site location used for data storage, analysis, and reporting.

e$.$ special database used to store data in OLAP reporting.