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Which among the following is incorrect with reference to a derivation tree?

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Which among the following is incorrect with reference to a derivation tree?

(a) Every vertex has a label which is a terminal or a variable.

(b) The root has a label which can be a terminal.

(c) The label of the internal vertex is a variable.

(d) None of the mentioned

I got this question in an online interview.

My question is from DPDA and Ambiguous Grammars in portion Push Down Automata of Automata Theory

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Right choice is (b) The root has a label which can be a terminal.

To elaborate: The root or interms of the grammar, starting variable can not be a terminal.

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