Please choose the correct solution to the question: How do you select a birch tree to harvest bark from?

Solution1: Observe the trees. If the tree has white bark, it can be harvested. If the tree has black bark, it has been harvested within the past few years and cannot be harvested yet. So, select a birch tree with white bark.

Solution2: Observe the trees. If the tree has green bark, it can be harvested. If the tree has black bark, it has been harvested within the past few years and cannot be harvested yet. So, select a birch tree with green bark.

Answer format: solution1/solution2
Answer: solution1