Placeholders are used to defend against what kind of hacking attack?
a
sql injection
b
key stroke logging
c
phishing
d
denial of service

(A) SQL injection

Explanation:

 Th SQL ( Structured query language) injection is the code injection method or technique that is basically used in data driven attack various applications. The SQL injections are basically used by hackers for attacking on various websites.

The SQL injection are used by the hackers to insert the malicious structured query language statement in the input state for the execution process in the database.  

When we use the SQL injection during that process, the attacker can easily access and modify the database.

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