When creating a data validation rule, you can specify both input message and an alert

To replace a defective UPS, the network administrator must take the switch offline. The administrator wants to be able to perform maintenance UPS in the future without affecting the availability of the attached switch. Which of the following would BEST allow this to happen?

A. Add a redundant power supply to the switch B. Implement stacking on the switches in the rack C. Add a second UPS into the rack D. Install a power converter for the switch

The header file that you must #include to have access to the Standard Library string class is

a)``` C-string ``` b)``` string.h ``` c)``` string ``` d)``` String.h ``` e) None of the above