Which of the Following Best Describes a Will Codicil

Which of the following best describes a will codicil?

A) A will codicil revokes an existing will.
B) A will codicil is a modification to a will that does not need all of the formalities of a will, so long as the required formalities were followed in executing the original will.
C) A will codicil is an instrument that names the testator.
D) A will codicil is a modification to an existing will that must follow all of the formalities of a will.
E) A will codicil is an order of a probate court to distribute the property of the testator.