Which of these (there are multiple) are correct ?

The laws of logarithms that you need are as follows:

 

ln(a*b) = ln(a) + ln(b)    (and ln(a/b) = ln(a) - ln(b))

ln(aⁿ)  = n*ln(a)

ln(e) = 1  

 

See if you can take it from here.