From the explanation below, the letter received by Basu is called a 90-day letter.
A 90-day letter can be described as an IRS notification in which it stated that there was a discrepancy or error in the taxes of an individual, and that they would be levied until a petition is submitted.
If the taxpayer does not respond within 90 days, the audit inadequacies will result in a reassessment.
Learn more about IRS here: https://brainly.com/question/11986964.
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