Which troubleshooting technique uses external markers to identify the portion of the block diagram in which the fault exists?

• A. Bracketing
• B. Tagging
• C. Annotation
• D. Labeling

Answer: (A)

Bracketing uses external markers to create a boundary around a group of blocks on the diagram. By placing visible brackets around a section, you designate a portion of the system to test or inspect, which helps you determine whether the fault lies inside that bracket or outside it. This boundary-focused approach lets you isolate the problem step by step, narrowing down the area to investigate without having to recheck the entire diagram at once. The other techniques serve different purposes: tagging assigns identifiers to signals or blocks, annotation adds notes, and labeling simply names elements. None of those inherently mark a boundary for fault isolation in the diagram.