Please help to understand what is ment by OPTIONS in this context:

"Options shall require the Principal's purchasing department's express and separate release in writing to constitute a final order."

at first i thought that it is "an option is an agreement or contract that gives someone the right to buy or sell something such as property or shares at a future date."
then i came to "optional equipment" and it seemed to me as a rather reasonable choice, but then further in the text i encountered this word in such context:

"As far as contradicting technical options are concerned, the Principal herewith reserves the right to determine what options have to be performed by the Contractor."

So, if it is equipment, it seems to me not very correct, since how can it be performed, "options have to be performed"

please help!!!