LAN and Probability

Question 1
There are n stations in a slotted LAN. Each station attempts to transmit with a probability p in each time slot. What is the probability that ONLY one station transmits in a given time slot?
A
np(1-p)n-1
B
(1-p)n-1
C
p(1-p)n-1
D
1-(1-p)n-1
       Computer Networks        LAN and Probability       Gate-2007
Question 1 Explanation: 
This question can be solved by binomial distribution,
nC1P1(1-p)n-1
= nP(1-P)n-1
There is 1 question to complete.