RadioShack’s embattled president and CEO, David Edmondson, resigned Monday following questions about his resume’s accuracy. The Fort Worth electronics retailer said in a statement that its board had accepted his resignation and had promoted Claire Babrowski, who most recently served as executive vice president and chief operating officer, to acting CEO. The Fort Worth company said last week that it would hire outside lawyers to investigate errors in Edmondson’s resume, including claims that he earned two college degrees for which the school he attended has no records. That investigation won’t continue since Edmondson quit, the company said.