Utilize the AI Platform Training with built-in algorithms to develop a customized model, requiring manual feature extraction and model tuning.

Develop a custom model from scratch to identify product keywords from the transcribed calls and then apply a categorization algorithm, which involves extensive data preprocessing and development effort.

Implement the Cloud Natural Language API to extract custom entities for categorization, which may not fully meet the customization needs for product classification.

Employ AutoML Natural Language to automatically extract custom entities for categorization, significantly reducing manual preprocessing and development time while allowing for customization.