Final answer:
Option B: Validity of the systems flowchart and specifics about its elements can only be accurately assessed with visual and contextual information.
Step-by-step explanation:
The segment of the systems flowchart mentioned deals with a user entering data from a source document to update a master file, which is a common process in information systems and business operations. When considering the correctness of the flowchart, it's important to examine industry standards and the specific context of the flowchart usage. However, without a visual aid, it's challenging to confirm which statement is correct about the flowchart. Generally, a systems flowchart is created properly if it accurately reflects the process it's meant to document and adheres to standard flowchart symbols and conventions. General standards suggest a well-constructed chart accurately reflects processes with clear symbols.
Regarding the use of a single disk to represent a master file, this is not an absolute requirement as multiple disks can represent distributed or backup storage for master data. Moreover, the type of line (solid or any other form) connecting the every day symbol typically signifies the flow or type of interaction between components. Lastly, stating the master data as a sequential data store requires additional context — it refers to how data is organized and may or may not be relevant based on the framework the flowchart represents.