An invoice is a bill sent after a sale is made.
Sales tax is a financial levy added to the price of a sale.
Octroi is a form of local tax on goods entering a municipal area.
All three—(a), (b), and (c)—are related to actual transactions or taxation on transactions.
A quotation, on the other hand, is simply an estimated price offered before a transaction occurs—it is not a document used for taxation or after-sale purposes.
Hence, option (d) stands apart in function and usage.