How many charts are issued for one GFA? What are they? What is their validity period?

a) One; Enroute chart; 3 days

b) Two; Surface chart and Upper Winds chart; 24 hours

c) Three; Enroute chart, Surface chart, and Significant Weather chart; 6 hours

d) Four; Surface chart, Upper Winds chart, Significant Weather chart, and Snapshot chart; 12 hours