Which of the following Greenhouse Gases (GHGs) was considered in the second compliance period of the Kyoto Protocol at Doha?

Nitrogen trifluoride was the greenhouse gas newly added in the Kyoto Protocol's second period at Doha.

The 2012 Doha Amendment set the second commitment period and brought this gas under control.

Sulphur hexafluoride was already covered in the protocol's first commitment period.

Hydrofluorocarbons were also among the gases controlled from the first period onward.

Perfluorocarbons likewise belonged to the original basket of Kyoto gases.

Nitrogen trifluoride is used in electronics manufacture and has a very high warming potential.