I would say A because the SETI Institute said, "Philip Morrison and Guiseppe Cocconi analyzed how two civilizations separated by many light years of space might use electromagnetic radiation to communicate.
Electromagnetic radiation is the general term for the more familiar light and radio waves."
So there you go!
Answer:
By seeing if there are any red lines under the words or go to tools.
Explanation:
Sometimes when you spell something wrong, there will be a red line under it. If not, and you're are not sure if it's correct, go to "tools" then select spelling and grammar then it'll give you corrections if they need to correct anything.
Answer:
nslookup ifconfig.
Explanation:
The nslookup is used a number of times by network admins to troubleshoot DNS related problems. In addition, this command finds IP addresses and name servers of hosts. This utility command queries the DNS database tables from every host in a network. It then determines the host name and issues an IP. It sort of converts your domain name into an IP addresses. This command combined with ifconfig finds the correct DNS servers and assigns the correct DNS server IP.
A PDF must be put into an external program after being exported to be edited, you can't make direct changes to it. This eliminates answer choice A.
You can print documents with other extensions besides .pdf, such as those of Word documents and such, it doesn't have to be a .pdf. This eliminates answer choice B.
Since you can't directly edit a PDF, C is a possible answer.
Files don't have to be saved as a .pdf, especially just for the first time. Whenever you save a file, first time or not, you can save it as anything, and there's no reason to have to save it as a .pdf. This eliminates answer choice D.
So the answer is C. it contains material you don't want changed.
Hope this helps!
