Which of the following statements are true? Choose the correct answer from the options given below:

1.Estimates for life expectancy can be obtained from a life table.

2.Improvement in life expectancy is one of the causes of population ageing.

3.Infant mortality rate is defined as the number of deaths of children below one year per 1000 mid year population.

4.Malthus proposed the demographic transition theory.

A1 and 2 only

B3 only

C3 and 4 only

D1, 2 and 3 only

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