Which of the following functions correctly returns the binary representation of a given decimal number? def dec_to_binary1(dec_num): r = dec_num % 2 q = dec_num // 2 binary = str(r) while q != 0: r = q % 2 q = q // 2 binary = binary + str(r) return binary def dec_to_binary2(dec_num): r = dec_num % 2 q = dec_num // 2 binary = str(r) while q!= 0: q = q // 2 r = q % 2 binary = str(r) + binary return binary def dec_to_binary3(dec_num): r = dec_num % 2 q = dec_num // 2 binary = str(r) while q != 0: r=0%2 q = 1/2 binary = str(r) + binary return binary def dec_to_binary4(dec_num): r = dec_num % 2 q = dec_num // 2 binary = str(r) while q != 0: q = 1/2 r= q % 2 binary += str(r) return binary O dec_to_binary1 (dec_num) dec_to_binary2 (dec_num) dec_to_binary3 (dec_num) dec_to_binary4 (dec_num)