Which term is described as 'sum to check data'?

Which term is described as 'sum to check data'?

• A. Error detection
• B. Parity check
• C. Echo check
• D. Check digit

Answer: (B)

Parity check uses a sum of the data’s bits to verify integrity. It works by adding a parity bit so the total number of 1s in a block of data is even (or odd, if you’re using odd parity). When the data is read or received, the system recalculates the parity. If the count doesn’t match the expected parity, an error is detected. This directly fits the idea of “sum to check data” because the method relies on summing the bits to decide whether the data has been altered. It’s a simple, fast way to catch many single-bit errors, though it can miss even numbers of bit flips. Other options describe different error-detection ideas: a general notion of detecting errors, an echo-back verification, or a numeric check digit for decimal data, which aren’t specifically about summing the bits to verify integrity.

Parity check uses a sum of the data’s bits to verify integrity. It works by adding a parity bit so the total number of 1s in a block of data is even (or odd, if you’re using odd parity). When the data is read or received, the system recalculates the parity. If the count doesn’t match the expected parity, an error is detected. This directly fits the idea of “sum to check data” because the method relies on summing the bits to decide whether the data has been altered. It’s a simple, fast way to catch many single-bit errors, though it can miss even numbers of bit flips. Other options describe different error-detection ideas: a general notion of detecting errors, an echo-back verification, or a numeric check digit for decimal data, which aren’t specifically about summing the bits to verify integrity.