C++ quiz. Which of the template declarations are correct?

Which of the template declarations are correct?

```
template<struct T> class A{};
```
```
template<union T> struct A{};
```
```
template<typename T> union A{};
```
```
template<union T> class A{};
```
```
template<class T> typename A{};
```
```
template<typename T> class A{};
```
```
template<class T> struct A{};
```

Explanation

It's possible to declare templates of classes (class), structures (struct) and unions (union). Template type parameters are declared using the class and typename keywords.

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