What is incorrect about this code snippet: var name = "Mike"; "Colleen" = name;

The choice highlighting the use of a constant on the left-hand side of the assignment is indeed accurate. In JavaScript, the left-hand side of an assignment must refer to a variable that can be assigned a new value. In this case, "Colleen" is treated as a string literal, which cannot be assigned a value, making the assignment invalid.

When an assignment is attempted with a string literal on the left side, the JavaScript engine will raise an error because string literals cannot have values assigned to them. They are immutable, meaning their value cannot be changed or reassigned at runtime. Thus, using a constant string like "Colleen" in this way leads to incorrect code.

This reflects a fundamental understanding of how variable assignment works in programming—specifically, that only variables (which can store and reference a value) can be used on the left-hand side of an assignment operation.