Which statements about pattern matching and flow scoping are correct?

Each correct answer represents a complete solution. Choose all that apply.

AFlow scoping means a pattern variable is only accessible if the compiler can discern its type.

BThe pattern variable cannot be accessed after the if statement in which it is declared.

CPattern matching with an if statement is implemented using the instanceof operator.

DPattern matching with an if statement is implemented using the instanceon operator.

EPattern matching with an if statement is implemented using the instance operator.

FPattern matching can be used to declare a variable with an else statement.