Exam 70-761 topic 1 question 10 discussion

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.
You query a database that includes two tables: Project and Task. The Project table includes the following columns:

The Task table includes the following columns:

You plan to run the following query to update tasks that are not yet started:
UPDATE Task SET StartTime = GETDATE() WHERE StartTime IS NULL
You need to return the total count of tasks that are impacted by this UPDATE operation, but are not associated with a project.
What set of Transact-SQL statements should you run?

A.

B.

C.

D.