An organization is struggling to keep up with the growth of their application which is running on legacy infrastructure. What might be holding them back?

An organization is struggling to keep up with the growth of their application which is running on legacy infrastructure.
What might be holding them back?

A. The time it takes their serverless compute function to scale B. The overreliance on platform as a service C. The inaccessibility of their data due to perimeter security D. The cost of provisioning hardware for peak usage