Which AS-PATH access-list regular expression should be applied on R2 to allow only updates that originate from AS-65001 or an AS that attaches directly to AS-65001?

Refer to the exhibit.

Which AS-PATH access-list regular expression should be applied on R2 to allow only
updates that originate from AS-65001 or an AS that attaches directly to AS-65001?

A.
^65001_[0-9]*$

B.
_65001^[0-9]*

C.
65001_[0.9]$

D.
^65001_*$