Which one among the following is an example of Artificial Intelligence's application ?

Spam email filtering is a classic and widely used application of Artificial Intelligence (AI), specifically utilizing Machine Learning (ML) algorithms. These filters analyze patterns in incoming emails—such as sender reputation, keywords, and metadata—to classify them as "spam" or "ham" (legitimate). Over time, these systems "learn" from user behavior (e.g., when a user marks an email as spam) to improve accuracy and adapt to new spamming techniques.

• Word processors (A), Presentation software (B), and Spreadsheets (D) are categorized as general productivity software. While modern versions of these tools may now incorporate AI-driven features (like predictive text or automated data analysis), the software categories themselves are traditional application tools.

In contrast, the core functionality of modern spam filters is fundamentally built upon AI and probabilistic modeling, making option C the most appropriate answer.