Caleb is developing the audit program for the financial statement audit of a regional hospital. Patient accounts receivable was identified in the risk assessment phase of the audit as an important asset account and one with a relatively high RMM due to the levels of IR and CR. Caleb has used confirmations on other engagements and is considering using confirmations as part of his audit procedures. He is unsure about two points: l. whether he should use positive or negative confirmations and 2. which specific assertions can be addressed through confirmations. Respond to each of his concerns. Be specific and refer back to the wording regarding assertions and the characteristics of audit evidence as discussed in the text.