Which two tasks should be created as functions instead of as procedures?

Which two tasks should be created as functions instead of as procedures? (Choose two.)

A.
Reference host or bind variables in a PL7SQL blockof code

B.
Tasks that compute and return multiple values to the calling environment

C.
Tasks that compute a value that must be returned to the calling environment

D.
Tasks performed in SQL that increase data independence by processing complex data analysis
within the Oracle server, rather than by retrieving the data into an application

Explanation:
Explanation/Reference:
Functions are used to return a value. Functions must return only a single value.
Procedure are used to perform an action.
Both functions and procedures are using to do a special task or action. In functions it is must to
return a single value, where as in procedures it’s not compulsory