This is true (answer a), but also a very generic, vague statement. Creating a loop of some sort would be an example.
Answer:
I Don't Know if this is right, but for the first part it would be people making hype for a product so more people know about it.
Sorry thats all I got, but i saw u had no other answers so I hope this did You some good :(
This is a TRUE statements
Answer:
The command to create a compressed archive (archive1.tar.gz) is

Explanation:
The explanation for the above command is
The general command to create a compressed archive is
tar -czvf name-of-archive.tar.gz /path/to/directory-or-files
Here, the terms are as follows:
-c : Creates an archive
-z : Compress the archive with gzip.
-v : This is known as verbose. This is an optional command and it displays the progress on terminal command. Without this the progress is not displayed on terminal command.
-f : Allows to specify the file name of the archive.
Here, if we want to archive multiple files, we provide the command the names of multiple files or directories of the files also can be used.
So, the command 
creates a compressed archive - archive1.tar.gz of files test1, test2 and test3.