Question: For a UTRA FDD User Equipment (UE) supporting DB-DC-HSDPA, which High Speed Downlink Packet Access (HSDPA) UE capability categories are subject to receiver single link performance requirements for HS-DSCH in multi-path fading environments?
Option 1: Categories 11-15
Option 2: Categories 16-20
Option 3: Categories 18-22, excluding 21
Option 4: Categories 21-24
Explanation: The correct answer is Option 4 because the requirements for receiver single link performance of HS-DSCH in multi-path fading environments apply to UTRA FDD UEs supporting DB-DC-HSDPA, specifically to HSDPA UE capability categories 21-24, ensuring these UEs meet necessary performance standards in various environmental conditions.