In a "Class A" network total 20 subnets are needed with maximum 260 hosts per subnets. Can 255.255.255.0 subnet mask be used in this?

In a "Class A" network total 20 subnets are needed with maximum 260 hosts per subnets. Can 255.255.255.0 subnet mask be used in this?

From the PGCB Assistant Engineer (CSE) September 2021 – Written (BUET) exam, question 2 of 7.

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