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Methods Of Error Detection (GCSE Computing)

The following is a GCSE Computing test covering 'Methods Of Error Detection' from the broader topic 2. Data Transmission. The test is geared towards the CAMBRIGE-IGCSE exam board style syllabus.
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Which statement best describes the primary purpose of error detection methods?
What is the role of an acknowledgement (ACK) in reliable transmission?
Which method is best at detecting burst errors (a group of consecutive flipped bits)?
A parity byte (longitudinal parity) is used mainly to:
Which of these is an advantage of using CRC over a simple checksum?
Why might a system use checksum instead of CRC?
Which error-detection method is most commonly used with file downloads and storage to verify integrity after transfer?
Which of these is a limitation of a single parity bit per byte?
Which method provides the lowest overhead (fewest extra bits) per byte while offering basic error detection?
What is a checksum in the context of data transmission?
In an ARQ system using ACK and NACK, what is a NACK?