Which characters is used to access property variables on an object-by-object basis?

Which one of the following is not a valid class name?

A. ShopProduct

B. Shopproduct

C. Shopproduct1

D. 1shopproduct

Fill in the blank with the best option. An Object is a/an ________ of a class.

A. type

B. prototype

C. instance

D. object

Which version of PHP introduced the visibility keywords i.e public, private, and protected?

A. PHP 4

B. PHP 5

C. PHP 5.1

D. PHP 5.3

Which characters is used to access property variables on an object-by-object basis?

A. ::

B. =

C. ->

D. .