Mary is an 80-year-old-widow. Last year, Mary earned investment income of $1,570, and she had no other income. For this year, she is eligible for the maximum OAS benefit of $7,217.40. If the maximum GIS benefit is $10,779.84, how much in OS/GIS payments is Mary entitled to receive? O a) $7,217.40 O b) $9,994.84 O c) $17,212.24 O d) $17,997.24