This article is probably not : A. credible.
An information source can be defined as a system (medium) through which information, knowledge and ideas may be obtained and used by an individual for other purposes. An information source can either be a primary or secondary source of information. The source options for information are television, radio, web, newspapers, journals, magazines, articles, etc.
The four criteria used to evaluate source options are;
- Accuracy.
- Authority.
- Currency.
- Objectivity.
Basically, any information source that meets or satisfies the aforementioned source option criteria is credible, factual and reliable for use.
A credible source can be defined as an information source that is unbiased, trustworthy and reliable because it's backed up by evidence from various information channel (medium).
This ultimately implies that, a credible source must have multiple information channel (medium) to validate its source of information and it should be accurate.
Hence, if an author doesn't cite any source for his or her research, the research work is considered not to be credible.
In conclusion, an article is probably not credible even if it was written by a qualified author with up-to-date information and realistic claims, but without multiple source to verify its claims.