If Circle Is a Structure, What Does the Following Statement

question 7

Multiple Choice

If Circle is a structure, what does the following statement do?
Circle *pcirc = nullptr;

• A) It declares an empty structure variable named *pcirc.
• B) It declares a structure pointer called pcirc initialized with a null pointer.
• C) The statement is illegal in C++.
• D) It initializes a null pointer with the value of the Circle pointer.
• E) None of these

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Definitions:

Depolarization

The process in which a cell's membrane potential becomes less negative, moving towards zero, which is critical in the initiation of action potentials.

Threshold Stimulus

Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.

All-Or-None Contraction

A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.

Muscle Fiber

A single, elongated muscle cell that can contract in response to stimulation.