In the following question, one phrase has been printed in bold. Select the correct meaning of the phrase from the options given below.
The criminal's tendency to use his own cell phone to conduct business was the chink in the armor the police needed to put him in jail.
1
A minor but very detrimental flaw or weakness
2
Strong point or talent
3
Core competency
4
A major flaw or weakness
5
None of the above