Which of the following procedures and methods are important in assessing a company’s ability to continue as a going concern?

Which of the following procedures and methods are important in assessing a company’s ability to continue as a going concern?

a. Performance of analytical procedures directed at profitability, asset turnover, and cash flows.
b. Discussions with management regarding future plans related to sales activities, cost controls, and marketing efforts.
c. Knowledge of the client’s business gained throughout the audit.
d. All of the above are important procedures and methods used in assessing going concern.