A network automation team maintains a long-lived 'release' branch and an active 'develop' branch. During testing on 'develop', an engineer commits a critical fix (commit a1b2c3d) that corrects a Jinja2 template rendering bug affecting production. The 'develop' branch also contains many unfinished features that must NOT be released yet. The team needs the fix deployed from the 'release' branch immediately, without merging any other 'develop' changes. Which Git operation accomplishes this?