Mrs Kelly was chief executive and managing director of St George Bank from 2002 to 2007 and CEO of Westpac from 2008 until early this year, overseeing a merger of the two banks in 2008.
Utilize the input text as a context reference, choose the right relationship between 'St George Bank' and 'Westpac' from the options.
Options: parent organization, position held, location of formation, stock exchange