What are the reasons why traditional networks cannot guarantee the quality of communication? (Multiple Choice)

What are the reasons why traditional networks cannot guarantee the quality of communication? (Multiple Choice)
A . Treat all messages indiscriminately
B . Allocate the resources needed for forwarding according to the order in which the packets arrive.
C . Unable to guarantee the communication quality of key services
D . The strategy adopted by the network device to process the message is the first in first out FIF

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Answer: ABCD