(c) Secondary Market
The market which deals in securities previously issued (already existing/pre-issued) is called the Secondary Market.
Source: Chapter 4, Section 4.1 Introduction
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The key phrase is "previously issued" — this directly points to the Secondary Market, where already-issued securities are traded among investors. The Primary Market is where securities are issued for the first time to raise capital. Examiners expect you to simply identify the correct option; no further explanation is needed for a 1-mark MCQ.