2. For the significant account, "revenue", what are the two "assertions that the auditor would most be concerned with? 1. Completeness and presentation and disclosure. II. Existence and occurrence. 111. Existence and completeness. IV. Completeness and allocation. 3. For the significant account, "accounts receivable" and the contra asset account, "allowance for doubtful accounts", what are the relevant "assertions"? CL Completeness and valuation II. Completeness and allocation. 111. Valuation and rights and obligations. IV. Valuation and Existence. 4. Relative to the revenue cycle, whare the key preventive internal controls? Select all that apply. I Input controls. II. Mailing account statements to customers monthly III. Segregation of duties. IV. 3-way match: customer order, shipping documents and invoice