The U1960 can load customized announcements one by one. The available customized announcement channel range is ().

Question

Options

• A0-251
• B0-311
• C252-255 and 261-311
• D252-255 and 261-380

• A
  14% (5)
• B
  5% (2)
• C
  3% (1)
• D
  78% (29)

Explanation

Option D is correct because the U1960 reserves customized announcement channels in two specific, non-contiguous ranges: 252–255 (4 channels) and 261–380 (120 channels), totaling 124 customized slots. Option A (0–251) is wrong because channels 0–251 are reserved for system/default announcements, not customizable ones. Option B (0–311) is wrong because it incorrectly includes the system-reserved range and misses the upper boundary. Option C (252–255 and 261–311) is a close distractor but understates the upper limit - the customized range extends to 380, not 311.

Memory tip: Think of it as a "gap sandwich" - channels below 252 are system-owned, 256–260 are a small reserved gap in the middle, and everything from 252–255 plus 261–380 is yours to customize. If you remember the upper ceiling is 380 (not 311), you can eliminate C immediately.

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