"Lock document after signing" option is missing

Hello,

I need a signature field on a PDF form I am developing to have the Lock Document After signing functionality. My coworker (who has since left the firm) designed a similar form that automatically checks this box in the Sign Document pop-up window. This is exactly what I want, but I can't figure out how to do it. I am using Adobe Acrobat X Pro (10.1.13).

What I CURRENTLY see, missing the lock document option:

What I WANT to see, taken from another PDF form:

Thanks in advance for any help