A rectangle has an area of 294 cm². What are the possibilities for the length and width, given they are whole numbers? Which possibility gives the smallest perimeter?
a) Length: 21 cm, Width: 14 cm; Perimeter: 70 cm
b) Length: 42 cm, Width: 7 cm; Perimeter: 98 cm
c) Length: 98 cm, Width: 3 cm; Perimeter: 202 cm
d) Length: 7 cm, Width: 42 cm; Perimeter: 98 cm