Choice 'a' is correct. The merger of two corporations requires that a special meeting be held and that notice and copy of the merger plan be given to all stockholders of both companies. A merger generally requires the approval of both the directors and stockholders.

Choice 'b' is incorrect. While the stockholders' approval is required, in most states a majority vote is required; no state requires a unanimous vote.

Choice 'c' is incorrect. While the board's approval is required, a majority vote and not a unanimous vote is required.

Choice 'd' is incorrect. There is no requirement that all liabilities owed by the absorbed corporation be paid before the merger because the merged corporation becomes obligated to pay such liabilities upon the merger.