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For an input sequence consisting of two opening brackets, such as `[[`, the correct completion to form a balanced sequence is `]]`. This sequence of closing brackets ensures each opening bracket is matched in the reverse order of its appearance, adhering to the Last-In, First-Out (LIFO) principle.

Completing the `[[` Bracket Sequence

A computer program is processing a sequence of characters to check for balanced brackets. It has just read the input `[[`. What sequence of characters must come next to form a complete and balanced sequence? Explain your reasoning based on the principle used to match brackets.

Balancing a Bracket Sequence

When completing a sequence that begins with `[[`, the first closing bracket `]` that is added serves to match the *first* opening bracket `[` from the original sequence.

A program is designed to ensure sequences of brackets are correctly nested and balanced. If the program has just processed the opening sequence `[[`, which of the following statements correctly analyzes the required closing sequence?

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