Discrete$-$time LTI systems interconnection and properties.

Two discrete$-$time LTI systems are$$connected in parallel.$$ The impulse response of one of the systems is$$h$1[$n$]=(12)$nu$[$n$],$ and the impulse response of the other system is$$h$2[$n$]=(12)$n$+1$u$[$n$1].$

Select all that apply; the overall system is$$

Group of answer choices

stable

memoryless

causal