It is Jeff's birthday, and while his friend's assume he is in his mid$-$thirties, none of them are sure exactly how old he is$.$ When they ask him his age, Jeff says, "old enough to know better, but too young to care." Jeff's age would be categorized as falling into which of the following components of the Johari Window?

Select one:

a$.$ Blind

b$.$ Unknown

c$.$ Hidden

d$.$ Open