At that point, returning officers were still appointed by the Governor in Council, but the Canada Elections Act was amended a few years ago to provide that returning officers are now appointed by the Chief Electoral Officer following a fair recruitment process.
Evidence of meeting #123 for Procedure and House Affairs in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was clause.
A video is available from Parliament.