Which natural language processing technology is available out-of-the-box in AEM for auto-text summarization?

The correct choice is Adobe Sensei, which provides a variety of AI and machine learning capabilities built into Adobe Experience Manager (AEM). One of its functionalities includes natural language processing, which allows for advanced features such as auto-text summarization. This technology can analyze and interpret text data, generating concise summaries that highlight key points, thus enhancing user experience and content management within AEM.

The other options do not provide the out-of-the-box functionality specifically for text summarization in AEM. CoreNLP, although a powerful natural language processing tool developed by Stanford, is not integrated directly into AEM as a standard feature. Adobe Target is focused on optimizing content delivery and personalization rather than text analysis or summarization. The Natural Text Analyzer is not a recognized or standard term associated with AEM's capabilities. Therefore, Adobe Sensei is the appropriate technology for implementing auto-text summarization in AEM.