Ideally, which environments should be targeted by interoperability testing? 

The Acme Elevator company uses state-transition diagrams to document the behavior of their elevator doors.

The following text is taken from one of their requirements documents. Convert it into the equivalent

state-transition diagram:

When the doors are open, the close command starts the doors closing.

When the doors are closing, the closed sensor indicates that the doors are fully closed.

When the doors are closed, the open command starts the doors opening.

When the doors are opening, the open sensor indicates that the doors are fully open.

If the doors are closing, the open command will start the doors opening.

If the doors are opening, the close command will start the doors closing.

Which state transition diagram most closely represents Acme's elevator door rules?

You have been assigned to test an application that allows users to conduct banking online. You have been asked to verify the various installation environments for the product. According to the specification the product supports four browsers (Edge, Chrome, FireFox and Safari), three operating systems (Windows, Mac, Unix), and four languages (English, Spanish, French, German). As you are reviewing the specifications you realize that the actual operating system names and versions were not included, only the major category. From this, you conclude that if you pick one from each of these sets (for example, select Windows 10 for the Windows OS), that testing should be sufficient. You have researched the product and determined that there should be no interaction between these three characteristics that would affect the operation of the system. However, you do want to exercise representative set of these options while conducting the other functional testing for the product. If you decide to test pairs of combinations, how many combinations will you need to test? 

You have just attended a cross-functional meeting during which a list of risk items was reviewed. After much discussion, each item was assigned a likelihood and impact rating by the group. Although there was some disagreement, the outcome was generally accepted by everyone who participated. You will now be working on planning the testing to address the identified risks in priority order. When you execute the tests, you will be conducting what type of activity?