A 9-year-old girl presents with multiple café-au-lait macules, axillary freckling, dermal and plexiform neurofibromas, and Lisch nodules. Her pedigree is shown in the diagram. The pattern marked A demonstrates vertical transmission across three generations with both males and females equally affected. Which of the following inheritance patterns is most consistent with this observation and the diagnosis of Neurofibromatosis Type 1?

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