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
b. It declares a structure pointer called pcirc initialized with a null pointer.
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Grace is considering the use of new identification cards in her organization that will be used for physical access control. She comes across the sample card shown here and is unsure of the technology it uses. What type of card is this?
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Given the resulting stack X below, what would be the result of each of the following?
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