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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