According to the Classical Theory of Employment, deviations from the state of full employment are considered to be purely temporary in nature. This means that any unemployment or underemployment that is observed is believed to be a short-term occurrence and will eventually be resolved.

Option 2 suggests that deviations from full employment are permanent in nature, which contradicts the Classical Theory. The theory suggests that the economy has a self-correcting mechanism that will bring it back to full employment in the long run.

Option 3 states that deviations from full employment are imaginary situations, which is not accurate. Unemployment and underemployment are real economic conditions that can have significant impacts on individuals and the overall economy.

Option 4 suggests that deviations from full employment are normal situations. While it is true that fluctuations in employment are a normal part of economic cycles, the Classical Theory of Employment considers deviations from full employment as temporary rather than the norm.

In conclusion, option 1 is the correct answer according to the Classical Theory of Employment, as it states that deviations from full employment are purely temporary in nature.