You then purchased a new Dell PowerEdge R520 Rack Server. The server is equipped with two Xeon E5-2400 CPUs, 32 GB RAM, four 1 TB SAS hard drives, and two 750-watt power supplies. You have a
21-inch LCD monitor connected to your server. You want a UPS to keep your server running in the
event of a power failure for up to 20 minutes. You prefer a rack-mounted solution. Use the UPS
selector tool at APC’s Web site (a well-known UPS vendor). The UPS selector is at
www. apcc. com/tools/ups_selector/.
Q. which model UPS will work well for this server, and state your reasons.

Write lines of verse that rhyme to remember the following information: acid rain is a type of air pollution caused by chemicals in the air.

Under which key category do the page up and page down keys fall? page up and page down keys fall under the keys category.

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.