What does a presence check validate?

What is the purpose of entry verification?

What does ISBN stand for?

What is the purpose of a checksum?

What is an input verification checksum?

What does a length check verify?

Which of the following is NOT a type of input check?

Which type of input check ensures that the input is in the correct format?

Which input check ensures that the input is not empty?

Which of the following is an example of a format check?

What is the purpose of the Luhn algorithm?

What happens if the calculated checksum doesn't match the received checksum?

What does the checksum digit in an ISBN represent?

What can barcodes be used for?

Which of the following is a benefit of using input verification checksums?