Find the Probability of One Event or a Second Event $8,161,441$

Find the Probability of One Event or a Second Event Occurring
-One digit from the number $8,161,441$ is written on each of seven cards. What is the probability of drawing a card that shows 8 or 4 ?

A) $\frac { 3 } { 7 }$
B) $\frac { 2 } { 7 }$
C) $\frac { 8 } { 7 }$
D) $\frac { 1 } { 7 }$