Flo$$s small business has become more and more successful, and lately she has become concerned that it may soon outgrow her computer equipment. When she needs more digital data storage, Flo can $\_\_\_\_\_.$

A$.$ scale out by purchasing a new computer with a faster processor and more disk storage

B$.$ scale up by purchasing a larger external drive and copying her data onto it

C$.$ scale up by moving from a centralized to a distributed data storage system

D$.$ scale out by migrating from a NoSQL to a relational database management system