Consider a recursive function decTOBin (decimal) that converts a decimal number to a binary representation but still in base 10. Note that all inputs and output are 32-bit integers. Example outputs: decToBin (7)=111 (one hundred and eleven) decToBin (23)=10111 (ten thousand, one hundred and eleven) decToBin (18)=10010 (ten thousand and ten) Which of the following is a valid base case for the recursive function decToBin? decimal