Which of the following is not an application of Flip Flop? O a. Binary parallel adder O b. Shift register O c. Counter O d. Register One of the drawback of a binary number system is O a. It needs less number of 1's and O's to represent a decimal number O b. It needs less number of 1's and less O's to represent a decimal number O c. It needs less number of 1's and more O's to represent a decimal number O d. It needs large sequence of 1's and O's to represent a decimal number