Why is an AP joining a different WLC than the one specified through option 43?

Refer to me exhibit.

Refer to the exhibit Remote users cannot access the Internet but can upload files to the storage server Which configuration must be applied to allow Internet access?
A)

B)

C)

D)

A customer transitions a wired environment to a Cisco SD-Access solution. The customer does not want to integrate the wireless network with the fabric. Which wireless deployment approach enables the two systems to coexist and meets the customer requirement?

Refer to me exhibit.

Refer to the exhibit. An engineer attempts to configure standby group 512 on interface GigabitEthernet0/1, but the configuration is not accepted. Which command resolves this problem?

What are two characteristics of Cisco SD-Access elements? (Choose two.)