BY which one of the following, an old written material which can not be read easily, can be read ?

BY which one of the following, an old written material which can not b

1.	BY which one of the following, an old written material which can not be read easily, can be read ?
A.	y - rays
B.	x - rays
C.	IR - rays
D.	Radio frequency waves
Answer» C. IR - rays