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What is the simplest type of data that Perl can work with?

...
and then (in the answer section):

The simplest type of data that Perl can work with is called a scalar. 
+Answer: C.

Which of the following commands should be used to open a filehandle na
+med
KAREN to an existing file named sw?
...
   2. open KAREN, ">sw";
   3. open "sw" KAREN;
   4. open ">sw", KAREN;

The command open KAREN, "sw"; should be used to open a filehandle name
+d KAREN
to an existing file named sw. Answer: B.

Which operator can be used to take the bottom item from an array?

...
   2. push
   3. pull
   4. plant