Which of the following is an example of a negative cash flow shock?

The company's biggest customer who accounts for $25\%$ of revenue stops making

payments because of a hostile,takeover.

Your company gives Account Collection people a bonus for who can collect the most

Accounts Receivable.

One of the $57$ delivery vans is involved in an accident and a new vehicle must be

purchased.

A customer who usually pays his account in $90$ days, pays it in $30$ days.