What Is the Purpose of Assurance Standards Issued by the AASB

What is the purpose of assurance standards issued by the AASB (Auditing and Assurance Standards Board) in Canada?

A) to expose the newly established standards to as many groups as possible
B) to provide current copies of the standards in advance of being placed in the CPA Handbook
C) to provide supporting reference material and other resources
D) to set standards for engagements such as reviews and compilations