UCLA Management Professor William Ouchi's Theory Z Embraced Which of the Following

UCLA management professor William Ouchi's Theory Z embraced which of the following management ideals?

A) Once hired, the employee would be assured of lifetime employment.
B) Employees would cooperatively solve problems and decisions would always be consensual.
C) Management would cautiously only concern themselves with an employee's work life.
D) An employee could be promoted, but both evaluation and promotion would not happen quickly.