Which of the following is a negotiable instrument?

Which note is some times printed in red?

Customer uses credit note record as:

When goods are returned, the supplier may issue:

Which one is allowed if the invoice is paid within a set time limit?

At the end of each month, a supplier usually will send:

A customer receiving goods not in satisfactory condition in respect of price or quality issues:

A customer issues debit note to the supplier asking to reduce in:

The price after the trade discount is:

Which one is deducted from invoice?