; and (D) the service recipient payor requires the service provider payee to work substantially full-time for the service recipient payor for a period of 4 consecutive weeks or more. (20) Substantially full-time The term substantially full-time means an average of 30 or more hours per week during the relevant period of time worked. (21) Written contract The term written contract means writing sufficient to indicate that a contract has been made between the parties that is legally enforceable in the jurisdiction or jurisdictions where the services by the service provider payee are performed or to be performed. 102. Classification (a) Bifurcated classification For purposes of this title, a service provider payee shall be classified as either an employee or an independent contractor in accordance with the following: (1) Mandatory independent contractors A service provider payee meeting the requirements of section 103 shall be classified as an independent contractor. (2) Mandatory employee classification A service provider payee meeting the requirements of section 104 shall be classified as an employee. (3) Elective classification service provider payees A service provider payee that meets neither the requirements of section 103 nor the requirements of section 104 shall be classified as the service provider payee elects in accordance with section 105. (b) Responsibility for initial determination (1) General rule Subject to paragraph (2), the service recipient payor is responsible for determining whether a service provider payee is properly classified as a mandatory independent contractor, a mandatory employee, or an elective classification service provider payee, for purposes of subsection (a). (2) Exceptions The service provider payee is responsible for determining whether the service provider payee is properly classified as a mandatory independent contractor if the classification of the service provider payee as an independent contractor is based on meeting the requirements of— (A) section 103(2)(A) (relating to