The function of intelligent routing is mainly divided into two parts. Which of the following options is correct?

The function of intelligent routing is mainly divided into two parts. Which of the following options is correct?
A . When an enterprise obtains multiple links with different bandwidths from different ISPs, in order to make full use of the bandwidth of each link, intelligent routing can be performed according to link bandwidth load sharing.
B . In order to allow the user to obtain the best access experience, the allocation of traffic can be dynamically adjusted according to the real-time transmission quality of each link.
C . You can preferentially use certain links to transmit traffic and use other links as backup links or load sharing links to improve service reliability.
D . Smart route selection can implement route selection based on global routing policies based on different requirements. It can also detect service availability, link availability, or link delay.

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Answer: D