When using the internet to conduct consumer research, be sure to a. use reliable websites. c. identify the purpose of the website. b. verify sources. d. all of the above.

d. all of the above.

Step-by-step explanation:

The Internet is a very useful tool for market research from the moment it facilitates an immediate relationship with potential informants (respondents, panelists, etc.), regardless of the geographical location of the researcher and the informant.

Well used, this tool can provide a reduction in costs and lead times in market studies. Companies face a new revolution in the way in which they have been carrying out their activity, both in terms of new products and services offered and in the new way of considering business and professional relationships with customers.

But before using the information present on the internet, we must ensure that the web page from which it is being obtained does not have any political, economic or social purpose but that it is maintained in a disinterested manner and that the source of the information is reliable and real to avoid confusion and erroneous information.

∠1≅∠2 by the alternate exterior angles theorem.

step-by-step explanation:

given, a ∥ b and ∠1 ≅ ∠3 .we have to prove that e ∥ f

we know that ∠1≅∠3 and that a || b because they are given. we see that by the alternate exterior angles theorem. therefore, ∠2≅∠3 by the transitive property. so, we can conclude that e || f by the converse alternate exterior angles theorem.

we have to fill the missing statement.

transitivity property states that if a = b and b = c, then a = c.

now, given ∠1≅∠3 and by transitivity property ∠2≅∠3 .

hence, to apply transitivity property one angle must be common which is not in result after applying this property which is ∠1.

the only options in which ∠1 is present are ∠1 and ∠2, ∠1 and ∠4

∠1 and ∠4 is not possible ∵ after applying transitivity we didn't get ∠4.

hence, the missing statement is ∠1≅∠2.

so, ∠1≅∠2 by the alternate exterior angles theorem.

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step-by-step explanation: