organic

If you take equal volumes a 1 M solution of NaCl and 1 M solution of KCl and mix them together, what would be final concentration of the salts? One option is right? explain how you worked it out
a.) The concentrations remain unchanged because they are both 1M
b.) The concentration of Cl would double
c.) the concentration of the salts would be halved
d.) The concentration of the salts would double