If a Solution with Time Complexity $\Theta$ (N²)is Known to Exist,then the Problem Is Known to Be

Multiple Choice

If a solution with time complexity $\Theta$ (n²) is known to exist,then the problem is known to be in which of the following?

A) $\Theta$ (n²)
B) O(n²)
C) $\Theta$ (n³)
D) $\Theta$ (n)