Comprehensive and Detailed Step-by-Step Explanation:
Thebiggest riskin cloud migration isdata security, especially unauthorized access by the cloud provider.
Option A (Correct):The cloud providermanages and stores organizational data, meaning that abreach, insider threat, or improper accessposes amajor risk. Properencryption and access controlsare critical.
Option B (Incorrect):Whilemulti-tenancy risks exist, cloud providers typically implement strongisolation mechanismsbetween clients.
Option C (Incorrect):Increased dependency on the provider is aconcern, but the impact depends onservice agreements and redundancy measures.
Option D (Incorrect):Limiting the right to audit is acompliance issue, butdata security risksare more critical.
Reference:ISACA CISA Review Manual -Domain 5: Protection of Information Assets- Covers cloud computing risks and security considerations.

Outsourcing the development of an e-banking solution when in-house technical expertise is not available can significantly reduce start-up costs. This is because the organization can avoid the expenses associated with hiring and training a full-time development team, purchasing necessary hardware and software, and maintaining the system1. While outsourcing can also potentially reduce the risk of system downtime, increase the ability to adapt the system, and provide direct oversight of risks, these benefits are not as immediate or guaranteed as the cost savings123.
References: Maxicus1, Forbes2, Strategy& - PwC3

The only thing that can be provided by asymmetric encryption is nonrepudiation. Nonrepudiation is the ability to prove that a message or transaction was originated or authorized by a specific party. Asymmetric encryption uses a pair of keys: a public key and a private key. The public key can be shared with anyone, while the private key is kept secret by the owner. If a message is encrypted with the sender's private key, only the sender's public key can decrypt it. This proves that the message was sent by the sender and not by anyone else. This is called digital signature and it provides nonrepudiation. Asymmetric encryption can also provide information privacy by encrypting a message with the receiver's public key, so that only the receiver's private key can decrypt it. However, information privacy can also be provided by symmetric encryption, which uses a single key to encrypt and decrypt messages. References:
* CISA Review Manual (Digital Version), Chapter 5, Section 5.21
* CISA Online Review Course, Domain 3, Module 2, Lesson 12