Question: Consider the following variable - length code for the following six letter alphabet: Which of the following changes will suffice to make this a prefix

Consider the following variable-length code for the following six letter alphabet:
Which of the following changes will suffice to make this a prefix-free code?
None (It is already a prefix-free code).
Change the code for a to 110.
Change the code for e to 1101.
Change the code for h to 1100.
Change the code for t to 1110.
Consider the following variable-length code for the following six letter alphabet:

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