Your teammate has asked you to review the code below, which is adding a credit to an account balance in Cloud Datastore. Which improvement should you suggest your teammate make? 
Definitions:
Solid State Drive
A type of data storage device that uses integrated circuit assemblies to store data, offering faster access time than traditional mechanical hard drives.
Optical Drives
A type of computer disk drive that reads and writes data from optical discs through laser beaming technology.
USB 3.0
A version of the Universal Serial Bus standard for computer connectivity that offers improved transfer rates compared to its predecessors.
Blu-ray
is a digital optical disc storage format, capable of storing high-definition or ultra-high-definition video, audio, and other data.
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