Chapter 02 · Section 2.1
Option Classification
XYZ call AUG 45
XYZ call AUG 50
XYZ call SEP 40
These options are all of the same
a) type;
b) class;
c) series.
Among the three classifications above "type" is the most general and "series" is the most specific.
There are only two types of options: calls and puts.
Options of the same class belong to the same type and are traded on the same underlying asset.
All three options above are calls (the same type) and they are traded on the same underlying asset; therefore, they are the same class.