Which of the following is incorrect?

A floating charge is a charge over a class of company assets which the company is unable to deal with freely in the ordinary course of business.

A floating charge must be registered at Companies House within 21 days of its creation, otherwise the charge is void against the other creditors.

A floating charge must be registered at the company's registered office, but a failure to do so does not affect the validity of the charge.

A floating charge is a charge over a class of assets which change from time to time.