$6\mathrm{.}1$ Multiple Conditionals $-$ "local variable may not have been initialized" error

What causes a$"$local variable may not have been initialized" error?

The variable has been declared outside the conditional but is not assigned a value until some code inside the conditional

The variable has not been declared but is used in an output statement The variable has been declared but there is no code that assigns a value to the variable

The variable has not been declared but there has been an attempt to store a value in it