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Suppose you see the following price quotation for XYZ stock options:

                       Calls                           Puts
              -----------------------         -----------------------
exercise      Mar       Jun       Sep         Mar       Jun       Sep
price
40            4         5         6           1        2 1/2      3
45            3        4 1/2      5         1 1/4      2 1/2    3 1/2
50          2 1/2       3         4         1 1/2      3          4
55            1        2 1/2    3 1/4         4        5 1/2    6 1/4
60            1         2         3         8 1/2      9 1/4     10
How many option series are there in this table? display  helpOptions belonging to the same option series have the same underlying, the same expiration date, the same exercise price, and are of the same type.