An attempt to obtain sensitive information such as username, password and credit cards details etc. for malicious reasons by posing trustworthy source in e-mails is called Phishing.

Here are the answers to the questions:

43. An attempt to obtain sensitive information such as username, password and credit cards details etc. for malicious reasons by posing trustworthy source in e-mails is called Phishing. * B

44. The diagram shows multiple client computers connected to a central server, where clients request resources from the server. This is best described as a Client/Server architecture. * B

45. OSI stands for Open System Interconnection in networking. * C

46. In Boolean algebra, the complement law states that $A + \bar{A}$ is equal to 1. * D

47. In database management systems, data is primarily stored in Table format (especially in relational databases). * C

48. A set of objects of the same type that share the same properties or attributes is known as an Entity set. * C

49. The Slide sorter feature allows you to organize and sequence slides in a presentation by viewing them as thumbnails. * A

50. In programming paradigms, encapsulation refers to the bundling of data and methods that operate on that data into a single unit, called a class or objects. * B