What needs to be done to the deployed fiber assets, in case a network is upgraded from a 10G to a 25G fiber access network?

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What needs to be done to the deployed fiber assets, in case a network is upgraded from a 10G to a 25G fiber access network?
A . Single mode fibers need to be swapped by multi-mode fibers.
B . Dedicated developed fibers for 25G speeds need to be deployed.
C . This is an impossible upgrade.
D . Don’t worry, your fiber assets are future proof, no swap is needed.

Answer: A