A Complete Reevaluation of the Student's Eligibility for Special Education

A complete reevaluation of the student's eligibility for special education services:​

A) is not necessary if school officials do not think it is needed.
B) must take place once a year if parents think it is necessary.​
C) must take place once every two years if  both parents and school officials think it is necessary.
D) must take place once every three years, unless both parents and school officials agree that such a review is unnecessary.