Multi-choice problem: Continue writing the next sentence in this paragraph:

How to decide when to save documents in pdf (acrobat) format
Review the reasons why some of your print-ready files will benefit when saved in pdf format.
Pdf creation programs give your sensitive documents added security in that the recipient cannot change the wording. Emailed documents will not rearrange in cyberspace if saved to pdf format.

OPT:
a). Any computer user can open a pdf document using a free, easily downloaded reader such as adobe acrobat. Decide which documents need to be protected through pdf format and why.;
b). Choose an email address and password set to 1 of two. Emails to pdf users will contain the same password.;
c). Unencrypted documents cannot be saved in pdf format and do not generally benefit from being saved as pdf format. Pdf format is non-encrypted and contains free pdf files.;
d). User files were never saved in pdf format. Certain windows libraries would also save a pdf file to pdf format.;
a).