Which two measures guarantee that the network of the company does not become a transit AS for Internet traffic?

A company is multihomed to several Internet providers using EBGP. Which two measures guarantee that the network of the company does not become a transit AS for Internet traffic? (Choose two.)
A. Prepend three times the AS number of the company to the AS path list.
B. Add the community NO_EXPORT when sending updates to EBGP neighbors.
C. Write AS-path access-list which permits one AS long paths only and use it to filter updates sent to EBGP neighbors.
D. Add the community NO_EXPORT when receiving updates from EBGP neighbors.

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