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Which is true about the following declaration (assume #include has been properly added): vector v; The declaration is invalid because you must state the number of elements the vector will hold. The declaration is invalid because you must state the type of elements the vector will hold. The declaration is invalid because you must state the size in bytes of the elements the vector will hold. The declaration is invalid because the correct data type is Vector, instead of vector. There's nothing wrong with the declaration. Which is true about the following declaration: HouseOfThings* d[34]; The declaration is valid if House OfThings is a defined class. The declaration is valid only if HouseOfThings is defined as a class and it has defined the default constructor. O HouseOfThings is a vector. The declaration will declare 34 instances of HouseOfThings. None of the above is true about the declaration. Assume the following declaration: vector; ages-nullptr; None of the above statements are syntactically correct