Can "if" statements in c have multiple conditions

Question

For example
if (a==0, b==0, c ==1)
{ ...

Answer 1

Yes they can, however, you should not chain them with a comma, it would lead to only the right-most expression being decisive for the result of the entire condition. Instead, use logical operators:
https://www.sololearn.com/learn/C/2925/

Answer 2

Use logical operator '&&' instead of commas.

Answer 3

Yes

Answer 4

Some challenge questions may trick you with the comma separators you used but the logical ones are most common here.