Which of the following statements about disability discrimination law is not true?

A、The requirements only effect employers of more than 20 employees;

B、Employers must adjust working arrangements or the physical features of premises to remove any disadvantage to disabled people;

C、For a individual to be defined as a disabled person, the physical or mental impairment must have an adverse effect of more than 12 months duration;

D、Public bodies have additional duties to protect and promote equality for disabled people