Which is the transmission mode if there is only one sender sending a message towards a receiver?

Which is the transmission mode if there is only one sender sending a message towards a receiver?

اگر صرف ایک بھیجنے والا کسی وصول کنندہ کو پیغام بھیج رہا ہو تو ٹرانسمیشن موڈ کون سا ہے؟
Explanation
  • In simplex transmission mode, communication is unidirectional.
  • It meaning that data flows only from the sender to the receiver.