Charley, age $32,$ was in a motorcycle accident. His injuries were such that he will be receiving monthly, non$-$taxable benefits from his insurance company for many years to come. His only taxable income is the CPP Disability Benefit of about $$13,000$ a year. What is the maximum CDSG and CDSB he can collect if he contributes $$1,500$ to a Registered Disability Savings Plan?

a$.$ $$2,600$

b$.$ $$1,000$

c$.$ $$3,500$

d$.$ $$4,500$