The national symbol of New Zealand is the bird Kiwi which is known to be unable to fly. However, the image of this bird is
a) a road sign which is set up on New Zealand roads leading to the airport,
b) a sign which marks cages with migration birds in zoos,
c) the identification sign of the military air force of the country,
d) the logo of vegetarian supermarkets which sell not kiwi but the fruit which bears the same name.