Identify the correct statements for the Nut:
(A) Chamfering is done to save material.
(B) A circular disc having a non-threaded hole is nut.
(C) A prism having a threaded hole is nut.
(D) Thickness of nut is equal to nominal diameter of its bolt.
(E) Only octagonal nuts are used every where.
Choose the correct answer from the options given below :