What type of resistors are typically referred to as having a metal film?

Metal film resistors are specifically made by depositing a thin layer of metal onto a ceramic substrate. This construction provides them with distinct electrical characteristics, such as a stable resistance value and low noise, making them suitable for applications that require high precision. The metal film allows for a consistent and uniform resistance across different temperatures and over time, which enhances their reliability in electronic circuits.

In contrast, ceramic resistors typically consist of a ceramic material with conductive elements and are known for their high-temperature stability and durability but do not specifically utilize metal films. Wire wound resistors, while offering high precision and power handling, are made by winding a metal wire around a core rather than using a metal film. Carbon composition resistors are constructed from a mixture of carbon particles and a binding material, which leads to higher noise levels and less stability compared to metal film resistors. Thus, the defining feature of metal film resistors makes option C the correct choice.