Joyce La Valle, CFA, is a portfolio manager at a global bank. La Valle has been told she should use a specific vendor for equity investment research that has been approved by the bank's headquarters. Because La Valle is located in a country different from the bank's headquarters, she is uncomfortable with the validity of the research provided by this vendor when it applies to her country and would like to use a local vendor on whom she has already conducted due diligence. Which research vendor(s) should La Valle use to avoid violating the Standards?