Value for k, for which A = [[k, 8], [4, 2k]] is a singular matrix is---?

Value for k, for which A = [[k, 8], [4, 2k]] is a singular matrix is---?

a) –4
b) 4
c) ±4
d) 0

From the BCIC Assistant Programer (CSE) 2022 – Written (BUET) exam, question 27 of 56.

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