Which of the following is a valid javasript statement?
a. if (x = 5) x == 2 * x;
b. if (x = 5) x =2* x;
c. if (x == 5) x == 2 * x;
d. if (x == 5) x = 2 * x;

*write a program that defines symbolic names for several string literals (chars between quotes). * use each symbolic name in a variable definition. * use of symbolic to compose the assembly code instruction set can perform vara = (vara - varb) + (varc - vard); ensure that variable is in unsigned integer data type. * you should also further enhance your symbolic logic block to to perform expression by introducing addition substitution rule. vara = (vara+varb) - (varc+vard).