Which are the four splice types described?

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Splice types describe how a fiber link is joined or routed in an outdoor network. The four commonly described splice types are straight splices, branch splices, butt splices, and universal (vault) splices. A straight splice joins two fiber ends in line to continue a run. A branch splice takes a main trunk and branches out to one or more drop fibers, typically inside a splice closure or junction. A butt splice is an end-to-end join of two fiber ends to extend a run with a butt joint. A universal (vault) splice is a splice arrangement used in a vault or handhole where multiple fibers are joined and organized to support branching within the network. This set is the one described in the material, so the correct choice is straight, branch, butt, universal (vault). The other options introduce a different type or omit one of these standard categories.