What is the difference between a Unicode and non-Unicode program? Select all that apply

What is the difference between a Unicode and non-Unicode program? Select all that apply
A . Offset positioning in a Unicode structure is restricted to flat data objects.
B . Byte-type data objects cannot be assigned to character-type data objects.
C . Offset positioning in a Unicode structure is restricted to character data ^ •―I objects.
D . Byte-type data objects cannot be compared to character-type data objects.

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Answer: A,B,C,D