Final answer:
TTY calls utilize standard abbreviations such as GA for Go Ahead, SK for Stop Keying, Q GA for Question Go Ahead, and HD for Hold to enhance communication efficiency.
Step-by-step explanation:
Standard abbreviations are commonly used in TTY (text telephone or teletypewriter) calls to facilitate communication. Four standard abbreviations used with all TTY calls are:
Using these abbreviations helps to make TTY communication more efficient and clear for both parties.