What are considered proper journalism practices when an important source does not respond to interview requests or provide important information? $($Choose all that apply.$)$Making an "educated guess" about the source's responses to questions and adding these responses to the story instead

Checking secondary information sources, such as government reports, to fill in the missing information

Specifically acknowledging in a news story that a source was contacted but did not respond or provide information

lgnoring the existence of the source and avoiding mention of them in the final story

Condecting addional tinterviews with other sources to help fit in the missing information