Which two statements are true for a two-dimensional array?

A two-dimensional array is fundamentally an array whose elements are themselves arrays, meaning it is an array of the specified array element type. For instance, in Java, an `int[][]` is an array of `int[]` objects.

In languages like Java, two-dimensional arrays can be "jagged arrays," where rows are not required to have the same length.

For jagged arrays in languages like Java, only the size of the first dimension must be specified at the initial declaration and allocation; subsequent dimensions can be specified later or individually.

In Java, all arrays, including multi-dimensional arrays, are objects and implicitly inherit from the `Object` class, allowing all its public and protected methods to be invoked on the array instance. This means methods like `toString()`, `equals()`, and `hashCode()` are available for array objects.