Two students 'A' & 'B' were tested a standardized I.Q. test. 'A' has an I.Q. of 60 and 'B' has an I.Q. of 30. Which of the following statement is not true about 'A' and/or 'B'

• A. 'A' has mild intellectual disability.
• B. 'B' has a severe intellectual disability.
• C. 'A' has a severe intellectual disability.
• D. Both (1) and (2) are true