For each of the following variables, determine whether the variable is categorical or numerical. If the variable is numerical, determine whether the variable is discrete or continuous. In addition, determine the measurement scale for each variable.
a. Name of Internet service provider
b. Time, in hours, spent surfing the Internet per week
c. Whether the individual uses a mobile phone to connect to the Internet
d. Number of online purchases made in a month
e. Where the individual uses social networks to find sought-after information