(a) Within 90 days after receiving a request under AS 42.40.360(b) the commissioner of natural resources shall by written decision
- (1) designate the identified land for railroad purposes and, subject to valid existing rights, convey the state's interests in the land to the corporation;
- (2) notify the corporation of reasons for refusal to designate the identified land for railroad purposes; or
- (3) approve the request in part and deny it in part and convey as appropriate.