(a) The legal relationship of employer and employee is defined by the act. Thus, an individual is performing service for an employer if:

1. (1) He is subject to the right of an employer, directly or through another, to supervise and direct the manner in which his services are rendered; or
2. (2) In rendering professional or technical services he is integrated into the staff of the employer; or
3. (3) He is rendering personal services on the property used in the operations of the employer and the services are integrated into those operations.