Final answer:
Software testing is a job task that a QA specialist would do.
Step-by-step explanation:
A QA specialist is responsible for ensuring the quality and functionality of software applications. Therefore, software testing would be a job task that a QA specialist would do. This involves conducting various tests to identify any bugs or issues in the software and providing feedback to the development team.
The other job tasks mentioned (marketing campaigns, event planning, and graphic design) are not directly related to software testing and do not fall under the responsibilities of a QA specialist.