Lauren and her parents reviewed the lesson information on how to stay safe online. When Lauren told her parents that she had been using the password "Computer1” for all of her online accounts, her mother suggested that she change it. Why did Lauren’s mother suggest she change her password? It could be easily guessed. It contained personal information. It contained only one number. It contained too many letters.

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.