What is the second link in the chain of transmission?
a-infectious agent
b-portal of entry
c-portal of exit
d-reservoirs

The chain of infection explains how infection gets from one place to another. The second link in the chain of infection transmission are the reservoirs. Correct D Reservoir includes places in the environment where the pathogen lives (this includes people, animals and insects, medical equipment, and soil and water).

a, b, c - sides of a triangle

a + b > c

a + c > b

b + c > a

we have a = 5m and b = 11m. substitute:

5 + 11 > c

16 > c → c < 16

5 + c > 11         subtract 5 from both sides

c > 6

11 + c > 5         subtract 11 from both sides

c > -6

c < 16 and c > 6 and c > -6

thereofre your answer is 6m < c < 16m

answer; i believe the correct answer is (secondary prevention);