Final answer:
STP (Shielded Twisted Pair) cables are designed to reduce signal interference in order to ensure a reliable and high-quality signal in networking environments.
Step-by-step explanation:
The correct answer is A) Signal interference. STP (Shielded Twisted Pair) cables are designed to reduce signal interference. These cables are commonly used in networking environments to minimize electromagnetic interference and crosstalk between wires. The shielding in STP cables helps to prevent external signals from interfering with the transmission of data, resulting in a more reliable and high-quality signal.