question 3

Essay

$$\text { Prove or disprove that } \boldsymbol { A } \boldsymbol { B } = \boldsymbol { B } \boldsymbol { A } \text { whenever } \boldsymbol { A } \text { and } \boldsymbol { B } \text { are } 2 \times 2 \text { matrices. }$$

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Definitions:

Electronic Fund Transfer

is the electronic exchange or transfer of money from one account to another, either within a single financial institution or across multiple institutions.

Stored-Value Cards

Prepaid payment cards that have a monetary value stored on them electronically, commonly used for transactions in place of cash.

Smart Cards

Physical cards with embedded integrated circuits that can process information, used for secure transactions and identification.

Security Programming

The process of designing and implementing software and systems with measures to protect against unauthorized access, use, disclosure, disruption, modification, or destruction.