Which device is used in wireless networks to send transmissions to a target area?

Optical fiber is a medium for wired data transmission using light pulses, not a device for sending wireless radio frequency transmissions to a target area.

An access point (AP) is a device that creates a wireless local area network (WLAN), but it typically uses an antenna (which could be omni-directional or directional) to broadcast; the AP itself is not the specific component that 'sends transmissions to a target area' in the sense of focusing the radio signal.

An omni-directional antenna broadcasts signals equally in all directions, making it unsuitable for sending transmissions to a specific 'target area' as it disperses energy broadly rather than concentrating it.

A directional antenna is used in wireless networks to send transmissions to a target area because it concentrates radio waves in a specific direction, increasing signal strength and range towards that area while minimizing interference to other regions. This is essential for point-to-point links or covering specific zones like a corridor or a stadium section.