Solution:'Cobra' is a high-level, object-oriented programming language used for general programming purposes, 'Python' is a high-level general-purpose programming language, 'Squirrel' is a programming language similar to 'Lua', but uses a 'C' like syntax and finally 'Java' is a popular high-level, class-based, object-oriented general-purpose programming language created in 1995. Hence, all four being computer languages, (d) is the correct option.