A group RRSP is a retirement savings plan sponsored by an employer that allows employees to contribute through regular payroll deductions and benefit from tax advantages and possible employer matching. The employer is responsible for choosing the plan provider, which is the financial institution that administers the group RRSP and offers a range of investment options for the employees to choose from. The employer may also negotiate lower fees and better services with the plan provider than what individual RRSPs can offer. Therefore, statement D is correct.

The other statements are incorrect for the following reasons:

Statement A: A group RRSP is less costly and time consuming to administer than traditional pension plans, as it does not require actuarial valuations, funding requirements, or regulatory filings.

Statement B: If you leave your employer, your group RRSP does not stay with the employer. You can transfer your group RRSP to an individual RRSP or another registered plan without tax consequences, as long as there are no locked-in provisions.

Statement C: You do not need to wait until you file your taxes to receive your contribution tax deduction. Your contributions are deducted from your gross income before tax is calculated, so you receive an immediate tax benefit on your paycheque.