How many distinct nodes are listed in the SAR transmission chain?

How many distinct nodes are listed in the SAR transmission chain?

• A. 3
• B. 4
• C. 5
• D. 6

Answer: (B)

Counting distinct nodes means tracing the signal’s path and listing each unique block it passes through, counting each stage only once even if the signal moves through the same block again. In a SAR transmission chain, you look at every functional block the signal enters from start to finish and tally how many separate blocks appear. The four distinct stages shown in the diagram are the four nodes the signal traverses, so the total is four. If there were fewer blocks, you’d get three; if there were more, you’d get five or six. The key idea is to ignore repeated visits to a node and focus on how many unique stages exist in the chain.

Counting distinct nodes means tracing the signal’s path and listing each unique block it passes through, counting each stage only once even if the signal moves through the same block again. In a SAR transmission chain, you look at every functional block the signal enters from start to finish and tally how many separate blocks appear. The four distinct stages shown in the diagram are the four nodes the signal traverses, so the total is four. If there were fewer blocks, you’d get three; if there were more, you’d get five or six. The key idea is to ignore repeated visits to a node and focus on how many unique stages exist in the chain.