It shall be unlawful for a person who has power to confer on another a qualification which is needed for, or facilitates, his engagement in employment in any capacity, or in a particular employment or occupation, in Northern Ireland to discriminate against him—
(a)by refusing or deliberately omitting to confer that qualification on him on his application, or
(b)in the terms on which the person is prepared to confer it, or
(c)by withdrawing it from him or varying the terms on which he holds it.