What is an audit confirmation, Accounting homework help

I have two questions about auditing need to be answered

1-  A CPA accumulates various types of evidence on which to base the opinion on financial statements. Among this evidence are confirmations from third parties. 

Required: 

a. What is an audit confirmation? 

b. What characteristics of the confirmation process and the recipient are important if a CPA is to consider the confirmation evidence appropriate? 

2- Herbert McCoy is the president of McCoy Forging Corporation. For the past several years, Donovan & Company, CPAs, has performed the company’s compilation and some other accounting and tax work. McCoy decided to have Donovan & Company conduct an audit. He had recently received a disturbing anonymous letter that stated, “Beware; you have a viper in your nest. The money is literally disappearing before your very eyes! Signed: A friend.” He told no one about the letter. McCoy Forging engaged Donovan & Company, CPAs, to render an opinion on the financial statements for the year ended June 30. McCoy told Donovan he wanted to verify that the financial statements were “accurate and proper.” He did not mention the anonymous letter. The usual engagement letter providing for an audit in accordance with generally accepted auditing standards (GAAS) was drafted by Donovan & Company and signed by both parties.
he audit was performed in accordance with GAAS. The audit did not reveal a clever defalcation plan. Harper, the assistant treasurer, was siphoning off substantial amounts of McCoy Forging’s funds. The defalcations occurred both before and after the audit. Harper’s embezzlement was discovered by McCoy’s new internal auditor in October after Donovan had delivered the auditors’ opinion. Although the scheme was fairly sophisticated, it could have been detected if Donovan & Company had performed additional procedures. McCoy Forging demands reimbursement from Donovan for the entire amount of the embezzlement, some $40,000 of which occurred before the audit and $65,000 after. Donovan has denied any liability and refuses to pay. 

Required:  Discuss Donovan’s responsibility in this situation. Do you think McCoy Forging could prevail in whole or in part in a lawsuit against Donovan under common law? Explain your conclusions.