Classify the frost susceptibility of the following soils:
a. Sandy gravel (GW) with 3 percent finer than 0.02 mm.
b. Well-graded sand (SW) with 4 percent finer than 0.02 mm.
c. Silty sand (SM) with 20 percent finer than 0.02 mm.
d. Fine silty sand (SM) with 35 percent finer than 0.02 mm.
e. Sandy silt (ML) with 70 percent finer than 0.02 mm.
f. Clay (CH) with plasticity index = 60.
