The order of a matrix is written as m×n where m is the number of rows and n is the number of columns.
Total elements in a matrix = m×n
Since the matrix has 12 elements, we need m×n=12
Option (A): 1×12
Number of elements = 1×12=12 ✓
Option (B): 4×3
Number of elements = 4×3=12 ✓
Option (C): 6×3
Number of elements = 6×3=18 ✗
Option (D): 6×2
Number of elements = 6×2=12 ✓
Valid orders are (A), (B), and (D) only.
Therefore, the answer is Option 1.