my question is
in the first look to this link




1- as I know when I want to play slide I must to pluck the first note and move fast my finger to the second note without
plucking it ? is this true in example (A)
and in the example (B) & (c) have I to pluck second note or not ?

1- how to play this note examples (A) & (B) & (c)more clearly and what different between of them
2- is the example (c) call it glissando