A shift in thought can be indicated by the use of C. an em dash.
An em dash is used to set of an interruption that is closely relevant to the sentence but is not grammatically part of it. These set of interruptions can be found in a list, illustration, restatement, shift in thought or tone, summary, or dramatic point.
Semicolon (;) is used to connect independent clauses.
Ellipses (. . .) are used to indicate that material is missing in the sentence or passage.
The Germans would then find a different way of transmitting their messages.
A hyphen would be suitable
It just depends on the subject that you are doing. .com is not the most reliable.
.gov and .edu are more reliable because they are from a government organization and a college or university,
Hope this is the answer you are looking for.
