Select the correct sequence of mathematical signs that

Find out the alternative which will replace the question mark?

Vaccination: Disease ∷ Maintenance:?

Select the set in which the numbers are related in the same way as are the numbers of the following set.

Select the option that represents the letters which, when sequentially placed from left to right in the blanks below, will complete the letter series.

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

Select the option that is related to the third term in the same way as the second term is related to the first term.

VGD: SDA:: USF : ?

Select the option that is related to the third number in the same way as the second number is related to the first number.

14: 112 :: ? : 312