This is an example of $\_\_\_\_\_\_\_\_\_\_\_.$

a$)$ Data Inconsistency

b$)$ Data Redundancy

c$)$ Data Security

d$)$ Data Updates

Student ID

Student Name

Teacher ID

Teacher Name

$1$

A

$100$

a

$2$

B

$100$

a

$3$

C

$200$

b

$4$

D

$200$

b

$$