Auser has requested a field that counts the number of child records associated with a custom object. these custom objects have a lookup relationship between each other, which feature would best accomplish this requirement?

a. apex trigger
b. roll-up summary field
c. lightning process builder
d. visual flow

Apower user needs you to install a second type of operating system on his computer to increase efficiency while running some specialized software programs. which installation technique should you use?

An endless cycle of creation and response on the internet is called

Working on this program in python 3.7: a year in the modern gregorian calendar consists of 365 days. in reality, the earth takes longer to rotate around the sun. to account for the difference in time, every 4 years, a leap year takes place. a leap year is when a year has 366 days: an extra day, february 29th. the requirements for a given year to be a leap year are: 1) the year must be divisible by 42) if the year is a century year (1700, 1800, the year must be evenly divisible by 400some example leap years are 1600, 1712, and 2016.write a program that takes in a year and determines whether that year is a leap year. ex: if the input is 1712, the output is: 1712 is a leap year. ex: if the input is 1913, the output is: 1913 is not a leap year. your program must define and call the function isleapyear(useryear). the function should return true if the input year is a leap year and false otherwise.