If a subclass constructor does not explicitly call a superclass constructor __________.
a. it must include the code necessary to initialize the superclass fields
b. the superclass fields will be set to the default values for their data types
c. Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor executes
d. Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes
d. Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes
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