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