Can someone please answer this for me ? What is data centre virtualization?

Data center virtualization is the process of designing, developing and deploying a data center on virtualization and cloud computing technologies. It primarily enables virtualizing physical servers in a data center facility along with storage, networking and other infrastructure devices and equipment.

The answer is c.  the soft ware is unable to you because it is open for the public to use. 

You have several options when you want to enter data manually in excel. you can enter data in one cell, in several cells at the same time, or on more than one worksheet at the same time. the data that you enter can be numbers, text, dates, or times. you can format the data in a variety of ways. and, there are several settings that you can adjust to make data entry easier for you.