The Best corporation employed Rajiv, a public relations specialist, in a one$-$year contract to create promotional materials for the company, including a company logo and brochures. Four months after he started working for Best, Rajiv was in a car crash and was unable to continue working as a result of his extensive injuries. His contract with the company was

discharged by operation of law.

discharged by impossibility.

terminated by waiver.

discharged under the frustration$-$of$-$purpose doctrine.