Suppose you wanted to declare a variable called mat that is an array of arrays of ints. The code to declare this variable would be ____________________.

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Given the following method header, which of these method calls is incorrect?

``` public void displayValue(int x, int y); ``` a. displayValue(a, b); // where a is a short and b is a byte b. displayValue(a, b); // where a is an int and b is a byte c. displayValue(a, b); // where a is a short and b is a long d. All of these would give an error.