Explanation:

Implementing the Knowledge-Centered Support (KCS) methodology at Universal Containers will primarily result in reduced issue resolution time. KCS is a best practice framework that focuses on creating, maintaining, and leveraging a knowledge base to solve customer issues efficiently.
By integrating knowledge creation and maintenance into the support process, agents can quickly access and use relevant, up-to-date Knowledge articles to resolve cases faster. KCS emphasizes capturing solutions during case resolution, improving article quality, and reusing knowledge, which directly reduces the time taken to resolve customer issues.
For Universal Containers, this means agents spend less time researching solutions, as KCS ensures articles are readily available and relevant. Salesforce’s Lightning Knowledge Implementation Guide and Trailhead module (Service Cloud Knowledge Setup) highlight KCS as a strategy to streamline issue resolution by embedding knowledge into the support workflow, leading to faster case closures.

Why Other Options Are Incorrect:
Option A: Reduced post-interaction time:
Post-interaction time refers to activities after customer interaction, such as case documentation or follow-up tasks. While KCS may streamline some post-interaction tasks by capturing knowledge during resolution, its primary focus is on reducing the time to resolve the issue itself, not post-interaction activities, per Salesforce’s KCS Practices Guide.

Option B: Reduced first contact resolution time:
First contact resolution (FCR) measures whether a case is resolved during the initial customer interaction. While KCS can improve FCR by providing agents with quick access to solutions, the broader benefit is reduced overall issue resolution time across all interactions, not specifically FCR, as noted in Salesforce’s Service Cloud Metrics documentation.

References:
Trailhead: Service Cloud Knowledge Setup
Salesforce Help: Lightning Knowledge Implementation Guide
Salesforce Help: Knowledge-Centered Support (KCS) Practices Guide
Salesforce Help: Service Cloud Metrics and Reporting