The CEO of Singapore Telecommunications-owned Optus apologised to Australia’s parliament for an emergency number outage that was linked to four deaths but declined to stand down, citing a need for stability.Stephen Rue started in the role a year ago following a massive cyberattack and separate half-day outage which resulted in the previous CEO leaving.On September 18, Optus said a failure of its “000” emergency line affected thousands of people and four died as a result of the inability to...