(1) A student may be identified as having a developmental delay if the student is:

(a) at least three and not yet nine years old; and

(b) functions at a developmental level two or more standard deviations below the norm in any one area of development or 1.5 standard deviations below the norm in two or more of the following areas:

(i) cognitive development;

(ii) physical development;

(iii) communication development;

(iv) social and emotional development; or

(v) adaptive functioning skills.