With Regard to IRS Announcements and Notices, Which of the Following

With regard to IRS Announcements and Notices, which of the following statements is CORRECT?:

A) IRS Notices contain guidance on substantive interpretations of the law.
B) IRS Announcements and Notices are published in the weekly Internal Revenue Bulletin.
C) IRS Announcements contain guidance on substantive interpretations of the law.
D) Only a) and b) are correct.
E) All of the above statements are correct.