It is either C or, as you said, D.
The standard American telephone number is ten digits, such as (555) 555-1234. The first three digits are the "area code," which, in the past, indicated in what part of the country the phone was located.
The regular American telephone number has 10 digits, such as (999) 000-0000. The nines, or 3 digits, are the area code of the phone.
They are required numbers that are based off of where the phone is, the area code.
The 9s in the input mask format is : ( B ) Any number or letter
The 9s in the number represent the area code from which a caller/phone is registered and this could be any number or letter, the american telephone format consists of 10 digits in which the first three is the area code which ic mostly any number or letter.
Hence we can conclude that The 9s in the input mask format is : ( B ) Any number or letter.
Learn more about American telephone number format : https://brainly.com/question/13076983
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