Logarithmic function

Q.

$lo{g}_{b}a=?$

1. $\frac{lo{g}_{10}a}{lo{g}_{10}b}$

2. $\frac{lo{g}_{e}a}{lo{g}_{e}b}$

3. $\frac{lo{g}_{10}b}{lo{g}_{10}a}$

4. $\frac{lo{g}_{e}a}{lo{g}_{e}b}$

Q.

$a^{{\log }_{c}b}=b^{{\log }_{c}a}\{a,b,c>0andc\ne 1\}$

1. True

2. False