Which additional bit is attached to binary code for the purpose of checking the accuracy of received data items?

The additional bit that is attached to binary code for checking the accuracy of received data items is known as a parity bit. A parity bit serves as a simple error detection mechanism that can help identify whether data has been altered or corrupted during transmission or storage.

When data is sent, a parity bit is calculated based on the number of '1' bits in the binary code. In the case of even parity, the parity bit is set to 0 or 1 depending on whether the count of '1' bits is even or odd, ensuring the overall count of '1' bits is even. Conversely, for odd parity, the bit is set to achieve an odd number of '1' bits.

This method provides a basic level of error detection, allowing for the identification of single-bit errors. If the received data, when including its parity bit, does not meet the expected parity condition, it can indicate that an error has occurred during transmission.

While checksums, redundant bits, and data bits play roles in data integrity and transmission, they serve different functions or are more involved methods compared to the straightforward approach provided by a parity bit in ensuring the accuracy of received data items.