**Core Concept**
The question is testing the understanding of diagnostic test strategies, specifically the concept of using tests in series mode. This involves administering multiple tests in a sequence to arrive at a diagnosis, where each test result influences the selection of the next test.

**Why the Correct Answer is Right**
In series mode, the tests are used in a stepwise manner, where the result of the first test determines the need for the second test, and so on. This approach is particularly useful when the prevalence of the disease is low, as it helps to reduce the number of unnecessary tests and improves the accuracy of the diagnosis. The series mode is often used in combination with a decision tree or a flowchart to guide the diagnostic process.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a valid diagnostic test strategy. The term "parallel mode" is sometimes used to describe the administration of multiple tests simultaneously, but it is not a commonly used term in medical diagnostics.
* **Option B:** This option is incorrect because it is a characteristic of diagnostic test strategies in general, not specific to series mode. All diagnostic tests are designed to provide information that can be used to make a diagnosis, but series mode is a specific approach to using these tests in a sequence.
* **Option C:** This option is incorrect because it is a characteristic of a different type of diagnostic test strategy. The term "sequential testing" is sometimes used interchangeably with series mode, but it is not a distinct concept.

**Clinical Pearl / High-Yield Fact**
When using diagnostic tests in series mode, it is essential to consider the test characteristics, such as sensitivity and specificity, and the prevalence of the disease being tested for. This will help to ensure that the tests are being used effectively to arrive at a diagnosis.

**Correct Answer: D.**