Question 1 1 pts A network dataset has many rows; each row introduces one existing link. For which of the following formats we must depict a multi-layer visualization? webpage 1, webpage 2, number of hyperlinks from the former to the latter doctor 1, doctor 2, number of hospitals they both work at city 1, city 2, air traffic between them, ground traffic between them > Question 2 1 pts In visualizing the following network, we want to color-code nodes with two colors: Blue for nodes whose degree is more than the network average degree, and red for nodes whose degree is less than the network average degree. How many nodes will be blue? 1 3 4 N Question 3 1 pts What is the density of a network with 6 nodes and 9 links? 0.9 0.66 0.6 0.3