Final answer:
Electronic grammar- and spell-checkers are not sufficient for thorough proofreading of business messages. Additional manual proofreading is crucial to ensure all errors are caught and messages are clear and professionally composed.
Step-by-step explanation:
The answer to the student's question regarding the sufficiency of electronic grammar- or spell-checkers for proofreading business messages is false. While these tools are helpful for catching common spelling and grammar mistakes, they are not foolproof. It is important for the sender to perform an additional manual proofread to catch errors that the software may miss, such as correctly spelled but misused words like 'there' instead of 'their'. Additional strategies include reading the message aloud, having someone else review it, or using a writing center for support, especially for critical business communications.