When accessing a map value in Go, a second optional _____ value can be used to check if the key exists.
- error
- bool
- panic
- string
In Go, when accessing a map, you can use a second optional value to check if the key exists. This value is of type bool. It is a useful practice to use this boolean value to avoid runtime panics when trying to access a key that doesn't exist in the map. The correct option is (2) bool.
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