What are the semantics of choice and fail statements?

(a) a choice statement allows alternatives to be explored, while a fail statement indicates no answer at that branch.
(b) there are no choice and fail statements in oz.
(c) a choice statement displays a search tree, while a fail statement indicates a unification failure.
(d) a choice statement indicates no answer at that branch, while a fail statement allows alternatives to be explored.

Match the steps of the process to julia's analysis. 1. analyze choices. current costs for making phone calls to foreign countries averages between five and ten cents a minute. 2. determine the goals. julia needs to reduce the cost of telecommunications without reducing her employees' ability to do their jobs. 3. gather data. the corporate computer network will be able to handle the increased traffic that will occur as a result of voip. 4. evaluate the decision. julia will have her it department set up voip in the smallest domestic office. 5. make the decision. julia will have employees document the benefits and problems that result from using the new technology.

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Match the items with their respective descriptions.