Which VTP mode allows for the configuration of VLANs to be created and deleted?

The correct choice is the Server mode in VTP (VLAN Trunking Protocol). In Server mode, a switch can create, delete, and modify VLANs within the VTP domain. This means that any changes made by a switch operating in Server mode can be propagated to other switches in the domain, allowing for a centralized management of VLANs. It plays a crucial role in maintaining consistency across the network by allowing the administration of VLANs across multiple switches efficiently.

In contrast, Client mode switches can only receive and use VLAN information but cannot create or change VLAN configurations. The Transparent mode allows a switch to pass VTP advertisements through but does not actively participate in the VTP domain by creating or modifying VLANs. The Off mode means that VTP is disabled, thus a switch in this state will not send or learn VTP information, giving it no capability to manage VLAN configurations at all. Thus, Server mode is indeed the only mode that supports the full creation and management of VLANs in a network.