Which of the following are true (log log here denotes the logarithm base 10)? I. log()+log()=log(+) log ⁡ ( a ) + log ⁡ ( b ) = log ⁡ ( a + b ) II. log(2)=2log() log ⁡ ( x 2 ) = 2 log ⁡ ( x )