Singtel, Singapore’s largest telecommunications company, confirmed on Thursday that it was in discussions with multiple parties over a potential stake sale in its Australian telecoms unit Optus, but said there was no certainty the talks would result in a deal.Optus has been owned by Singtel since 2001. The company did not say which parties it is speaking with.In May, Singtel said it was open to bringing in an Australian minority partner for Optus while reaffirming its commitment to the...