Question: If we use extended Vigenere cipher ( 2 6 English letters and 1 0 decimal digits ) to encrypt ITCC 4 3 1 using key

If we use extended Vigenere cipher (26 English letters and 10 decimal digits) to encrypt ITCC431 using key word ENG751. Then, we obtain ---------------------- as a ciphertext. Note that Z=25,0=26,1=27,2=28...... Hint: Use modular arithmetic.
a.
N4I9ZU5
b.
M5I9ZT5
c.
M6I9ZU5
d.
M7I9ZW5
e.
None of these

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