Final answer:
The best method to invite providers to bid on the costs to provide direct deposit is a Request for Proposal (RFP).
Step-by-step explanation:
The method that best describes the process of inviting providers to bid on the costs to provide direct deposit to employees is Request for Proposal (RFP). An RFP is a formal invitation that outlines the company's requirements and asks potential providers to submit a proposal detailing their solutions and costs. By using an RFP, Company XYZ can ensure a fair and competitive bidding process, allowing them to evaluate different providers and choose the one that best meets their needs and budget.