Which JSON script is properly formatted?

This script is improperly formatted because it attempts to define an array following the "car" key, but then lists key-value pairs directly inside the array without enclosing them in curly braces to form objects.

This script is improperly formatted because it starts with double curly braces `{{` which is not a valid JSON root element; JSON must begin with either a single curly brace `{` for an object or a square bracket `[` for an array.

This script is properly formatted JSON because it begins and ends with curly braces, indicating a root object, which contains a key-value pair where the key `car` maps to a nested object containing valid, comma-separated key-value pairs.

This script is improperly formatted because it starts with square brackets `[`, indicating an array, but then places a single key-value pair directly inside the array, which is syntactically incorrect; an array should contain a list of values (objects, strings, numbers, etc.), not direct key-value pairs.