I Know These Questions Are Very Basic, but I Still Somehow Find them Confusing.

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C++

1.Is this valid;

int * p = new int [4][5];

if not why;
(i.e. is dynamically allocating multidimensional array allowed?)

2. How does one return the address of a variable in dynamically allocated array;
Is the following valid?

class MyClass
{
int *p;
MyClass();
int Func();
};

MyClass::MyClass()
{
p = new int [3][4];
}



int *MyClass::Func()
{


return &p[3];//This is the line in doubt
}