According to the S.O.S. method, what is the essential first "Shape" step when solving $\frac{2}{3} + \frac{1}{5}$?

Convert the fractions to mixed numbers.

Find a common denominator for the fractions.

Multiply the numerators and the denominators.

Simplify each fraction before adding.

Which expression shows the correct "Shape" step for solving $1\frac{3}{4} \div \frac{2}{3}$ before you operate?

$\frac{4}{7} \times \frac{3}{2}$

$\frac{7}{4} \times \frac{3}{2}$

$\frac{7}{4} \times \frac{2}{3}$