This has changed to just `#a`.  See https://github.com/NUBIC/ncs_navigator_core/blob/master/lib/ncs_navigator/core/surveyor/survey_taker.rb and https://github.com/NUBIC/ncs_navigator_core/blob/master/spec/support/survey_completion.rb for more information.

You may also be interested in this diff for commit https://github.com/NUBIC/ncs_navigator_core/commit/11d01c1daa5775fb1ec6d5e9f0ba72a87c389527.