"Montreal protocol", which was adopted due to the rising concern of depleting ozone layer, banned certain compounds. According to you, which of the following compound was banned?

Chlorofluorocarbon

Since the ozone layer prevents most harmful wavelengths of ultraviolet light from passing through the Earth’s atmosphere, observed and projected decreases in ozone have generated worldwide concern. This led to the adoption of the Montreal Protocol banning the use of chlorofluorocarbon (CFC) compounds, as well as other ozone depleting chemicals such as carbon tetrachloride, trichloroethane (also known as methyl chloroform), and bromine compounds known as halons.