Question: In 3GPP NR (New Radio) for a DL-SCH (Downlink Shared Channel) transport block, how are the CRC (Cyclic Redundancy Check) parity bits determined based on the payload size (**K**)?
Option 1: The number of CRC parity bits is always fixed at 16 bits regardless of the payload size (**K**).
Option 2: The number of CRC parity bits is set to 24 bits if **K** ≥ a certain threshold, and to 16 bits otherwise.
Option 3: The CRC parity bits are dynamically adjusted based on **K**, with no specified upper limit for the number of parity bits.
Option 4: CRC attachment is only applied for transport blocks where **K** exceeds a specific size, using a fixed 8-bit parity.
Explanation: According to the 3GPP NR specifications, CRC parity bits depend on payload size (**K**). For larger payloads (if **K** ≥ a certain threshold), a 24-bit CRC is used; for smaller ones, a 16-bit CRC is utilized, balancing error detection with overhead based on transport block size.