Which type of connector is not pull proof?

The ST connector is not considered pull-proof due to its design and locking mechanism. Unlike other types of connectors that feature latching mechanisms or more robust securing methods, the ST connector uses a bayonet-style twist and lock mechanism. While this can provide a degree of stability, it does not eliminate the risk of accidental disconnection when pulled with significant force.

In contrast, connectors such as SC, LC, and MPO are designed with features that enhance their resistance to pulling forces. SC connectors use a push-pull coupling, LC connectors incorporate a latch mechanism that secures the connection firmly, and MPO connectors are designed with robust alignment and locking features suitable for high-density applications. These characteristics make them more reliable in environments where connectors may be subjected to movement or strain.

Option D stands out primarily because its design lacks the increased pull resistance found in the other connectors, making it less suitable in situations where a secure and stable connection is essential.