Question: What condition must be met for the values of 'a' and 'b' in the calculation of Sidelink PRS channel occupancy ratio (SL PRS-CR), where 'a' is a positive integer and 'b' is either 0 or a positive integer?
Option 1: `a + b` must be less than or equal to 500 slots
Option 2: `a + b + 1` must equal either 1000 or 2000µ slots, with `b < (a + b + 1)/2`
Option 3: `a` must always be twice the value of `b`, with a maximum sum of 1500 slots
Option 4: The sum of `a` and `b` is irrelevant as long as `n + b` does not exceed the grant's last transmission opportunity
Explanation: This option correctly reflects the conditions for 'a' and 'b', ensuring their sum plus one equals either 1000 or 2000µ slots, with 'b' being less than half of the total sum of 'a', 'b', and 1, crucial for accurately calculating SL PRS-CR in sidelink communications within 5G NR systems.