When a state renders valid a license issued by another Contracting State, as an alternative to issuance of its own license, the validity shall:
a. Not extend beyond 15 days after the validity of the license
b. Not extend beyond the period of validity of the license
c. Be at the discretion of the Contracting State rendering it valid
d. Be at the discretion of ICAO
a. Not extend beyond 15 days after the validity of the license
b. Not extend beyond the period of validity of the license
c. Be at the discretion of the Contracting State rendering it valid
d. Be at the discretion of ICAO