The use of a disclaimer of opinion generally indicates

a. The auditors have observed a departure from generally accepted accounting principles that is so material that a qualified opinion is not justified

b. The auditors are very uncertain with respect to an item and cannot form an opinion on the fairness of presentation of the financial statements as a whole

c. The auditors are uncertain with respect to an isolated item that is material but not so material that the auditors cannot form an opinion on the fairness of presentation of the financial statements as a whole

d. The auditors have observed a departure from generally accepted accounting principles that has a material effect upon the fairness of presentation of financial statements but the departure is not material enough to justify a qualified opinion