Which of the following is true of salt lakes

Since you did not give the choices, I'll just have to state what are salt lakes.
A salt lake also known as saline lake, is a landlocked body of water that has a concentration of salts. 
These salts are typically sodium chloride and other dissolved minerals significantly higher than most lakes.  In some cases, salt lakes have a higher concentration of salt than sea water which are also termed as  hypersaline lakes.