Electrical equipment installed in Zone $20,21,$ and $22$ hazardous $($classified$)$ locations shall have the temperature markings specified for ignitible fibers$/$flyings$,$ less than $165C(329F)$ for equipment that is not subject to overloading, or $?$ for equipment $($such as motors or power transformers$)$ that may be overloaded.

I. $120C$

II$.120F$

III. $248C$

IV$.248F$

a$.$ I. and II$.$

b$.$ I. and III.

c$.$ I. and IV$.$

d$.$ II$.$ and III.