How many children does a binary tree have?

How many children does a binary tree have?

a) 2
b) 0
c) 0 or 1 or 2
d) Any number of children

From the NPCBL Executive Trainee (CSE) 2023 – Preliminary exam, question 19 of 39.

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All questions in NPCBL Executive Trainee (CSE) 2023 – Preliminary