关于药学信息来源，不正确的叙述是 （）

A.各科学术会议文献、研究简讯，国内外医药界各专业学科交流发表的论文

B.未经批准的广告宣传

C.国内外期刊、图书和索引

D.经药政部门批准的药厂的产品介绍和说明书

E.药典和处方集，如《中华人民共和国药典》、《英国药典》（BP）等

Before going out of town for one week, Ayaz asked his friend Farhan to look after his designer clothing store during his absence. The next morning Farhan noticed that the store locks had been tampered with, so he had them replaced. In order to boost the sales of Ayaz’s store, Farhan offered to customers a 20% discount on all items in the store. Upon his return, Ayaz was unhappy with this situation and immediately removed the discount. Disappointed with Farhan’s handling of the store matters, Ayaz has approached you for advice.Required:Analyse the situation from the perspective of the law of agency and explain what rights and remedies Ayaz has against Farhan. (10 marks)