The three virtual machines share one CPU thread, and the main amount is 2.86Hz. The resource reservation of VM1 is 1000MHZ, VM2 and VM3 do not reserve resources; the quota of VM1 is 1000, the quota of VM2K is 2000, the quota of VM3 is 4000; the upper limit of three virtual machines is 2000MHZ; the CPU usage of three virtual machines is 100% of cases, the CPU resource of VM3 is ().
A . 1200MHz
B . 1600MHz
C . 1800MHz
D . 2000MHz
Answer: A