Question: Which of the following UTRA/TDD frequency band options ONLY includes a range within the 2500 MHz range for both uplink and downlink transmission?
Option 1: b) 1850 - 1910 MHz & 1930 - 1990 MHz
Option 2: e) 2300 - 2400 MHz
Option 3: d) 2570 - 2620 MHz
Option 4: a) 1900 - 1920 MHz & 2010 - 2025 MHz
Explanation: This question requires the identification of a specific frequency band allocated for UTRA/TDD operations within the 2500 MHz range. Option 3, d) 2570 - 2620 MHz, is the correct answer because it is the only option that falls within the specified range (i.e., within the 2500 MHz range) and is designated for both uplink and downlink transmission in UTRA/TDD systems. The other options either fall outside this specific range or do not match the criteria of being within the 2500 MHz range for both uplink and downlink.