Identify the error in the following segment of code. Assuming the user has declared and entered real values for price$1,$ price$2,$ quantity$1,$ quantity$2,$ the program is to calculate the total cost.

cost$1=$ price$1*$ quantity$1$

cost$2=$ price$2*$ quantity$2$

total cost $=$ cost$1+$ cost$2$

In lines $1$ and $2$ the $"*"$ should be changed to $"+".$

Line $3$ uses incorrect variable name or names.

The $"+"$ in line $2$ should be changed to a $"*".$

Lines $1$ and $2$ uses incorrect variable name or names.