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The correct answer is D.

OBJ-1.3: Mechanical Transfer Registered Jack (MT-RJ) is a small form factor fiber-optic cable connector which resembles the RJ-45 connector used in Ethernet networks. MTRJ is commonly used with fiber optic switchports due to its size. The Straight Tip (ST) connector uses a bayonet plug and socket connector that was the de facto standard for most fiber optic commercial installations. The Subscriber Connector (SC)is a popular fiber-optic connector due to its low cost, durability, and simple installation for both point-to-point and passive optical networking. The Lucent Connector (LC) is a miniaturized version of the SC connector but is still larger than an MTRJ connector.

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