The answer to this question is letter "A. cite a source". Citing a source is an important content of the presentation so as not to take the credit away from the real source of the ideas presented. Not citing the sources could be a ground for plagiarism.
The default is normal view orientation.
Saving a newly created file
Select Save from the File menu.
Name the file.
Maybe like 3-5 I think im right
>>> s = "012345678"
>>> s
'012345678'
>>> s[ 1 : 6 ]
'12345'