Which of the following is correct about audits of private companies?

Question $1$ options:

Audits of private companies include audits of both financial statements and of ICFR

Audits of private companies are governed by the standards developed by the AICPA

Audits of private companies are governed by the standards of both$-$the AICPA and the PCAOB

Auditors typically provide an opinion about the operating effectiveness of internal controls of private companies if auditors decide to test operating effectiveness of controls