BPA and Call order option periods

I have a BPA that expires 7/27/2027. There are several call orders issued against the BPA - which also have option periods. Some of these option periods run past the BPA expiration of 7/27/2027. For example, one option is set to begin 9/30/2027 - is it correct that this option on the call order - cannot be exercised - because the base BPA has expired? I have researched and get conflicting information - on that "Yes, it can be exercised and used even though the base BPA has expired because the initial call order was issued - with the options - before the base BPA expired. If exercised, after the base BPA has expired -there could be no scope changes (additional CLINS, etc). " but I have also read conflicting information that "No, an option on a call order could not be exercised, if that date is past the date the base BPA has expired".

This is a GSA issued BPA.

Help - I just want to make sure I inform customers correctly that they may not be able to use some of the last options on their call orders - as the base BPA has lapsed (7/2027) - but Im not sure if that is a correct statement.

Any FAR references or other guide is appreciated!

Thanks!