Ordered pair that represents time complexity of divide phase and combine phase of merge sort algorithm respectively is:

1. The divide step takes constant time, regardless of the subarray size. It indicates constant time by Θ(1) left parenthesis, 1, right parenthesis.
2. The conquer step, where we recursively sort two subarrays of approximately n/2 elements each, takes some amount of time, but we'll account for that time when we consider the subproblems.
3. The combined step merges a total of n elements, taking Θ(n), left parenthesis, n, right parenthesis time.

Therefore Answer is Option 1