The OPTION method of VPGL Language acquires the object described in option field of invokers tile.
OPTION takes 1 input and emits 1 output. OPTION starts on arriving the object on input 0, then takes the object described in option field of invokers (of the method defined by this grid) tile.
If this invoker has no option field or option is unidentified for other reason (invoker is top-level for example), OPTION emits void object.