Please answer all questions

Question 7 Given a class Spaceship with private field numYears and method: public void addNumYears (int numYears) ,answer to the following questions: 1. In addNumYears , which would set field numYears to 0? numYears = 0; . this (numYears)0 . this.numYears=0; 2. In addNumYears, which would assign the parameter numYears to the field numYears numYears = this.numYears; this.numYears numYears: 3. In addNumYears(), which would add the parameter numYears to the existing value of field numYears? . this.numYears-this.numYears numYears: this.numYears = numYears + numYears; Not possible. Practice Problems -set 3, Page 6