A systems administrator has migrated a web application to the cloud with a synchronous uplink speed of 100Mbps. After the migration, the administrator receives reports of slow connectivity to the web application. The administrator logs into the firewall and notices the WAN port is transmitting at a constant 12.5MBps. Which of the following BEST explains the reason for the issue?

A. Misconfigured subnetting
B. Insufficient compute
C. Firewall issues
D. Not enough upload bandwidth