Smoking, Drinking, Use of drugs, problems with uterus, Problems with cervix or placenta.
The answer is 2-to-the-power-of-n, since for every input, the number of different combinations doubles. From your list I think answer A is meant to indicate 2ⁿ.
Answer and Explanation:
top level class can not be declare as private or protected. It is always public. If we declare a top level class as private then the compiler always complain that the private is not allowed and if we declare top level class as protected then compiler complain that modifier protection is not allowed here. so we can not declare top level class as private or protected
