A technician wants to increase the reliability of a DHCP server. Which of the following components should be installed to increase the server's uptime on the network?

Increasing RAM can improve server performance but does not directly enhance reliability against hardware failures or increase uptime due to component redundancy.

Using a lower voltage power supply is more likely to cause instability or underpower components, leading to decreased reliability rather than increased uptime.

Adding a hardware firewall enhances network security by controlling traffic but does not contribute to the server's internal hardware reliability or uptime in case of component failure.

Installing redundant NICs provides fault tolerance, ensuring that if one network card fails, the server can continue to communicate on the network using the other operational NIC. This significantly increases the server's uptime by eliminating a single point of failure for network access.