alleryIdentity matrix I has:
A1s on diagonal, 0s elsewhere; AI = A for any A
BAll 1s except diagonal
CAll zeros
DAll 1s
Answer & Solution
Correct answer: A. 1s on diagonal, 0s elsewhere; AI = A for any A
Identity matrix I_n: square n × n with 1's on diagonal, 0's off-diagonal.
**For any compatible A:** AI = A = IA.
Multiplicative identity for matrices.
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