8 files declare their use of ActivityAnswerPluginBase in Opigno module 3.x

FileUploadActivityAnswer.php in ActivityTypes/opigno_file_upload/src/Plugin/ActivityAnswer/FileUploadActivityAnswer.php

H5pActivityAnswer.php in ActivityTypes/opigno_h5p/src/Plugin/ActivityAnswer/H5pActivityAnswer.php

LongAnswerActivityAnswer.php in ActivityTypes/opigno_long_answer/src/Plugin/ActivityAnswer/LongAnswerActivityAnswer.php

ScormActivityAnswer.php in ActivityTypes/opigno_scorm_activity/src/Plugin/ActivityAnswer/ScormActivityAnswer.php

SlideActivityAnswer.php in src/Plugin/ActivityAnswer/SlideActivityAnswer.php

TincanActivityAnswer.php in ActivityTypes/opigno_tincan_activity/src/Plugin/ActivityAnswer/TincanActivityAnswer.php

TrueFalseActivityAnswer.php in src/Plugin/ActivityAnswer/TrueFalseActivityAnswer.php

VideoActivityAnswer.php in ActivityTypes/opigno_video/src/Plugin/ActivityAnswer/VideoActivityAnswer.php