Question: Consider the three nodes Cavity, Catch, ToothAche that are being added to the belief network. Let's say Cavity and Catch are already added and connected

Consider the three nodes Cavity, Catch, ToothAche that are being added to the belief network. Let's say Cavity and Catch are already added and connected as shown below (solid arrow). Once ToothAche is added, which dashed arrow(s) need to be connected? (1 or 2 or both: mark below)? Explain why. (Hint: think in terms of cause and effect.)
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