When STA6 initiates a request to AP1 for the first time, which of the following statements is correct?

As shown in the figure, there are 4 online STAs (STA1-STA4) under AP1 radio frequency, and 1 online STA (STA5) under AP2 radio frequency. The load balancing start threshold 5 is exceeded, and the maximum number associated users supported by AP1 and AP2 radio frequencies is 10, and the configured load difference threshold is 10%.

When STA6 initiates a request to AP1 for the first time, which of the following statements is correct?
A . AP1 is first calculated according to the load balancing algorithm, and STA6 is allowed to access
B. AP1 is calculated according to the load difference threshold algorithm first, and STA6 is allowed to access
C. AP1 is first calculated according to the load balancing algorithm, and STA6 is denied access
D. AP1 is calculated based on the load difference threshold algorithm first, and STA6 is denied access

Answer: D