Cookies are structured plain text files stored locally on your computer. There are no special tools required to read or understand them.

Which of these is most likely a plain text cookie?

"user=kevinMcK; expires=Wed, 26 Dec 2019 12:00:00 UTC;"789dff91d422c040cacb46c8c0715d4b;

Exactly! Cookies are simple plaintext files. Sometimes you can figure out a cookie's purpose just by reading it. 

Cookies get stored as plain text files. This option looks like an encrypted file without any structure.