Chapter 3, Problem 21PS

Given the following definitions, which of the following statements are valid assignments?

$\begin{array}{|l|}\hline \text{\#define NUM10 10}\hfill \\ \text{int x;}\hfill \\ \text{int y}=\text{15;}\hfill \\ \text{a}\text{. x}=\text{5;}\hfill \\ \text{b}\text{. y}=\text{5;}\hfill \\ \text{c}\text{. x}=\text{y}=\text{50;}\hfill \\ \text{d}\text{. x}=\text{50}=\text{y;}\hfill \\ \text{e}\text{. x}=\text{x}+\text{1;}\hfill \\ \text{f}\text{. y}=\text{1}+\text{NUM10;}\hfill \\ \text{g}\text{. 5}=\text{y;}\hfill \\ \hline\end{array}$